This might help.
This is a custom view I added to my LFForms database (note this assumes you are on version 11 Update 2 or Update 3 - there is a field that was named differently prior to 11 Update 2).
This view roughly mimics the Monitor page (when searching for all in-progress instances).
Note that it does list multiple rows of data for instances that have multiple tasks in progress, or tasks assigned to multiple users and not claimed by 1 of them.
I use this for some automated reporting and workflows, and I do use it in Power BI for some metrics as well.
There is one spot you need to update, labeled as "ENTER_THE_EMAIL_ADDRESS_OF_YOUR_LASERFICHE_ADMINISTRATOR_HERE".
SELECT [Process Name], [Instance name], [Started by], [Last updated], [Assigned to], [Assigned to (username)], [Assigned to (email)], [Current step], [Step start date], [Start date], [Instance ID], [Step due date]
FROM (SELECT instance.bp_name AS [Process Name], instance.title AS [Instance name], CASE WHEN start_user.displayname LIKE '%WORKFLOW%' THEN 'Workflow' ELSE start_user.displayname END AS [Started by],
instance.lastacted_date AS [Last updated], CASE WHEN bp_worker_resume.status = 5 AND assigned_user_snapshot.displayname IS NOT NULL
THEN assigned_user_snapshot.displayname WHEN bp_worker_resume.status = 5 AND assigned_user_snapshot.displayname IS NULL
THEN assigned_user_record.displayname WHEN bp_worker_resume.status = 2 THEN assigned_user_snapshot.displayname WHEN assigned_user_team_snapshot.displayname IS NULL AND
teams.name IS NOT NULL THEN CONCAT(teams.name, ' (Listing the Team Manager)') WHEN assigned_user_team_snapshot.displayname IS NULL
THEN teams.name WHEN bp_worker_resume.status = 1 THEN assigned_user_team_snapshot.displayname END AS [Assigned to], CASE WHEN bp_worker_resume.status = 5 AND
assigned_user_snapshot.username IS NOT NULL THEN assigned_user_snapshot.username WHEN bp_worker_resume.status = 2 AND assigned_user_snapshot.username IS NOT NULL
THEN assigned_user_snapshot.username WHEN assigned_user_team_snapshot.displayname IS NULL AND team_users.username IS NOT NULL
THEN team_users.username WHEN bp_worker_resume.status = 1 AND assigned_user_team_snapshot.username IS NOT NULL
THEN assigned_user_team_snapshot.username ELSE 'Laserfiche Administrator' END AS [Assigned to (username)], CASE WHEN bp_worker_resume.status = 5 AND
assigned_user_snapshot.displayname IS NOT NULL AND assigned_user_snapshot.email IS NOT NULL THEN assigned_user_snapshot.email WHEN bp_worker_resume.status = 5 AND
assigned_user_snapshot.displayname IS NULL AND assigned_user_record.email IS NOT NULL THEN assigned_user_record.email WHEN bp_worker_resume.status = 2 AND
assigned_user_snapshot.email IS NOT NULL THEN assigned_user_snapshot.email WHEN assigned_user_team_snapshot.displayname IS NULL AND team_users.email IS NOT NULL
THEN team_users.email WHEN bp_worker_resume.status = 1 AND assigned_user_team_snapshot.email IS NOT NULL
THEN assigned_user_team_snapshot.email ELSE 'ENTER_THE_EMAIL_ADDRESS_OF_YOUR_LASERFICHE_ADMINISTRATOR_HERE' END AS [Assigned to (email)], CASE WHEN bp_worker_resume.step_name IS NOT NULL
THEN bp_worker_resume.step_name ELSE bp_steps.name END AS [Current step], CASE WHEN bp_worker_resume.assign_date IS NOT NULL
THEN bp_worker_resume.assign_date ELSE bp_worker.update_date END AS [Step start date], instance.start_date AS [Start date], instance.bp_instance_id AS [Instance ID],
bp_worker_resume.due_date AS [Step due date]
FROM dbo.cf_bp_main_instances AS instance LEFT OUTER JOIN
dbo.cf_user_snapshot AS start_user_snapshot ON start_user_snapshot.id = instance.user_snapshot_id LEFT OUTER JOIN
dbo.cf_users AS start_user ON start_user.user_id = start_user_snapshot.user_id LEFT OUTER JOIN
dbo.cf_bp_worker_instances AS bp_worker ON bp_worker.bp_instance_id = instance.bp_instance_id LEFT OUTER JOIN
dbo.cf_bp_steps AS bp_steps ON bp_steps.step_id = bp_worker.current_step_id AND bp_steps.process_id = bp_worker.current_process_id AND (bp_steps.step_type = 'catchEvent' OR
bp_steps.step_type = 'serviceTask') AND bp_steps.is_deleted = 0 LEFT OUTER JOIN
dbo.cf_bp_worker_instnc_to_resume AS bp_worker_resume ON bp_worker_resume.worker_instance_id = bp_worker.instance_id LEFT OUTER JOIN
dbo.cf_bp_worker_instance_history AS bp_worker_history ON bp_worker_history.instance_id = bp_worker.instance_id AND (bp_worker_history.status = 'assigned' OR
bp_worker_history.status = 'reassigned') AND bp_worker_resume.resume_id = bp_worker_history.assigned_resume_id AND bp_worker_resume.owner_snapshot_id IS NULL LEFT OUTER JOIN
dbo.cf_user_snapshot AS assigned_user_snapshot ON assigned_user_snapshot.id = bp_worker_resume.owner_snapshot_id LEFT OUTER JOIN
dbo.cf_users AS assigned_user_record ON assigned_user_record.username = assigned_user_snapshot.username LEFT OUTER JOIN
dbo.cf_user_snapshot AS assigned_user_team_snapshot ON assigned_user_team_snapshot.id = bp_worker_history.target_snapshot_id LEFT OUTER JOIN
dbo.teams AS teams ON (teams.id = bp_worker_resume.team_id OR
bp_worker_resume.team_id IS NULL AND teams.id = bp_worker_history.team_id) AND bp_worker_resume.owner_snapshot_id IS NULL LEFT OUTER JOIN
dbo.team_members AS team_members ON team_members.team_id = teams.id AND team_members.member_rights = 3 AND team_members.leave_date IS NULL LEFT OUTER JOIN
dbo.cf_users AS team_users ON team_users.user_id = team_members.user_group_id
WHERE (instance.status = 1) AND (bp_worker.status <> 6) AND (bp_worker_resume.status = 5 OR
bp_worker_resume.status = 1 OR
bp_worker_resume.status = 2) AND (bp_worker_resume.assign_date IS NOT NULL) AND (bp_steps.step_type IS NULL OR
bp_steps.step_type = 'catchEvent') OR
(instance.status = 1) AND (bp_worker.status <> 6) AND (bp_worker_resume.assign_date IS NOT NULL) AND (bp_steps.step_type IS NULL OR
bp_steps.step_type = 'catchEvent') AND (bp_steps.step_id IS NOT NULL) OR
(instance.status = 1) AND (bp_worker.status <> 6) AND (bp_worker_resume.status = 5 OR
bp_worker_resume.status = 1 OR
bp_worker_resume.status = 2) AND (bp_steps.step_type IS NULL OR
bp_steps.step_type = 'catchEvent') AND (bp_steps.step_id IS NOT NULL) OR
(instance.status = 1) AND (bp_worker.status <> 6) AND (bp_steps.step_type IS NULL OR
bp_steps.step_type = 'catchEvent') AND (bp_steps.step_id IS NOT NULL) AND (bp_steps.step_id IS NOT NULL) OR
(instance.status = 1) AND (bp_worker.status = 3) AND (bp_steps.step_type = 'serviceTask')) AS subquery
GROUP BY [Process Name], [Instance name], [Started by], [Last updated], [Assigned to], [Assigned to (username)], [Assigned to (email)], [Current step], [Step start date], [Start date], [Instance ID], [Step due date]