Hi Pawel,
Is the help status bar a custom module in your app?
If it’s not, please report the issue via our support ticketing system to ensure it is being properly received by our tech support and tracked: https://www.appeon.com/standardsupport/newbug. And please provide a small reproducible case for us to verify and analyze the issue.
If it is a custom module, the problem may be that when the TabbedView control is opened, the display height of the MDI client area is automatically reduced.
It is recommended that you check whether the relevant code settings are reasonable.
You can refer to the following link for detail.
https://docs.appeon.com/pb2022r2/application_techniques/Displaying_sheets_in_tabbed_view.html
Adds an internal tabbed view control on the top of the MDI client area and displays the sheets opened in the MDI window as tab pages automatically. The height of the main window is automatically adjusted to show the tabbed view.
BTW, if you think the problem has nothing to do with the help status bar in your app, it is a bug of TabbedView control, please provide a small case to reproduce and report a bug to us. Thanks!
Regards,