Comment 17 for bug 1850103

ADDITIONAL INFORMATION ABOUT WINDOW TITLEBAR BUTTONS AND TOP BAR BUTTONS (GNOME-TWEAK-TOOL ONLY)

If you have installed Unite (a window decoration multi-function extension, store in .<email address hidden>):

Window titlebar and Top Bar buttons do not "slide" off the titlebars out of sight if buttons are configured to display in Unite > Appearance > Top bar window buttons position > RIGHT or LAST or AUTO

In the GNOME-tweak-tool Main Menu, the setting for Window Titlebars > Placement may also introduce a conflict in the way window button animations occur in GNOME-tweak if they don't match the Unite settings (however, Unite includes an AUTO setting which might be used to avoid this.)

As is warned in the Ubuntu Software tool, GNOME-shell-extensions can cause settings conflicts, depending on which extensions one is running. So your mileage may vary. Notably, the options in some of the extensions displayed in GNOME-tweak-tool are no longer available by clicking on the gear icon. -- However, I found that these options can be changed in Ubuntu Software > Addons > Shell Extensions > Extensions Settings (button.) GNOME-shell-integration with extensions in web browsers have been disabled in Ubuntu 19.10, and now GNOME-tweak-tool seems to be losing functionality as well, all being superceded by the Ubuntu Software tool.