Most designers change the title via javascript to something relevant for the form they are designing. Typically the form title. We can wait for javascript support in the modern designer and continue to add the js in every single form we build or you could add a feature to customize the tab title.

As Lexie mentioned, we typically change the page title for our forms to something other than "New Submission" to make it align with the form title.

Feature Request: Forms Document Title - Laserfiche Answers

I understand the use case now. Forms uses the name of the user task as the document title when open a user task. It will be easier for us to change the document title to use the message start event name without supporting customization. Will this work for you?

Yes! That will work.

@████████ I think using the Message Start Event name is a good option, but it might be better as an optional setting, like with a checkbox, since people might prefer "New Submission" over it defaulting to "Message Start Event" on all of their existing forms if they hadn't changed that.