Windows incorrectly docking in Studio, malformed windows

[ElephantMesh]

With release 558, users who are still facing this issue will encounter a dialog to reset their layout.

Hitting reset will reset your layout and resolve the issue permanently.

If you do not receive this dialog, or the dialog did not resolve the issue, you may follow the steps here

Windows incorrectly docking in Studio, malformed windows

If anyone here is still having issues, delete the registry key Computer\HKEY_CURRENT_USER\SOFTWARE\Roblox\RobloxStudio\LayoutSettings in regedit. This will reset your studio layout and will most likely fix the problem. Edit: If you are having another issue that is not fixed after deleting this key, try deleting the higher up RobloxStudio key.

or here

Studio Design Refresh - Docking Overhaul & Ribbon Upgrade

Hi Studio Users! We have added a new feature that let’s you reset the docking layout of Studio through the click of a button. The action is called Reset View, which can be accessed through Quick Open (Ctrl+Alt+P). It can also be added to Quick Access Bar Actions for easier access. Attaching a video that demonstrates how to use the feature.

to force reset your layout

After a reset, this issue should not be encounterable again.