I'm not sure if the Azure joined status would affect this but the Windows Client picks up the repository list from the HKCU registry if they have been manually attached. By default, the LF Windows Client will attempt to scan the network for repositories and this can cause a delay when loading this list, hence it can be disabled (Right Click the repository selection area and de-select "Scan network for repositories"). Under the hood this adds/updates the "Thunk" registry setting under HKCU\Software\Laserfiche\Client8\Profile\Options to 0 (disabled) or 1 (enabled, scans network).

For the repositories though, these correspond to registry keys under HKCU\Software\Laserfiche\Client8\Profile\IPDatabase with the key name being the name of the repository (string value, "Repository1") and the key data is the FQDN of the Laserfiche server ("lfserver.domain.local"), i.e.