There is no close button in the upper right of the app in Writer. * There is in Calc. There isn't even a "BACK" button like the smartphone mode. Loolwsd 4.2.2, Collabora Office 6.2-9
Modify the first comment. The "CLOSE" button is not displayed in Calc.
Please upload screenshots of what the apps look like for you.
Created attachment 159543 [details] No close button There is no close button in the upper right. It may appear when user reopen the file.
Indeed, I could reproduce this with the docker image, though not with a local build. Thanks for reporting!
Fixed by the combination of the following commits, thanks to Szymon Kłos: https://cgit.freedesktop.org/libreoffice/online/commit/?id=e9384302d1ca4758580c4c68f57fedf802989f15
Single commit, rather.