If you drop a file on the GUI where the path+filename are long enough, the gadget (red cross) to close the project may be no longer reachable as the tab becomes too wide to fit the window boundaries. Tested with v88.0 on Manjaro Linux x64 at a 1024x768 resolution, everything up to date. I dunno if this is something that can be worked around in the code or a bug/limitation in Qt.
Hey. Unfortunately there’s no perfect solution. In the preferences → “GUI” → “Layout” you can turn on “Elide text in tab widget headers”, but that only helps so much. Qt will still not elide too much text, meaning that when your names get very, very long & the window is too small, the close button will still not be visible. This is definitely an issue in Qt.
Luckily there’s a plethora of ways to close tabs, from Ctrl+W to “Multiplexer” menu → “Close” & middle-clicking the tab header with your mouse.