If I have several SQL Query/Procedure editor windows open at once in SQL Server Management Studio (where tabs are shown at the top of the editor window), and want to moved one of the tabs by dragging a tab to the left or right, most times SSMS will crash. I have used this feature for years, and did not notice the first crash until updating to the 18.7.1 version. It appears that if I am extremely careful, and do not allow the moving tab (while it is just a 'ghost' outline) to drop into the editor portion of the window, I don't think it crashes... but I haven't have the best of luck trying to avoid that 'violation'.
Also, sometimes I get a restore option when I reload SSMS, but many times, I do not even get that, so any work done up to that point was lost. So I have to train myself to try to save work before attempting the tab relocation task.