Recently had to rebuild my laptop. Reinstalled Nextcloud and started it syncing. It chose to ignore 2 folders due to size. I checked the two red folders and there, barely above the bottom bar on the scree were the edges of buttons. No matter what I tried I couldnt change the height of the window, was able to make it a little more narrow. I chanced it and clicked the first button which started the last two folders syncing. Now details on my system.
OS: Parrot linux (Debian based/origins) release 4.1 64-bit
Kernel 4.16.10-parrot16-amd64 x86_64
Mate 1.20.3
Using the client package for Debian built by m4lvin
https://m4lvin.github.io/nextcloud-client-debian-packaging/
Screen res 1366x768