Hi Kim,
Here is my findings:
Below is my resolution when I invoke xrandr command. I changed to size 0 ( 1024 x 768) as we discussed last week which is the lowest requirement resolution for Quartus and I can reproduce the issue. The issue resolved ONLY when I changed other than that. I can see "apply" and "ok" button. Since for you is not working out, my suggestion is to try external monitor which has higher screen size and resolution as a workaround. Let me know any update from you. I am sorry for the inconvenience caused.
*0 1024 x 768 ( 260mm x 195mm ) *0
1 1280 x 1024 ( 325mm x 260mm ) 0
2 1366 x 768 ( 347mm x 195mm ) 0
3 1600 x 880 ( 406mm x 224mm ) 0
4 1600 x 900 ( 406mm x 229mm ) 0
5 1920 x 1000 ( 488mm x 254mm ) 0
6 1920 x 1080 ( 488mm x 274mm ) 0
7 1920 x 1200 ( 488mm x 305mm ) 0
8 2540 x 1400 ( 645mm x 356mm ) 0
9 2560 x 1440 ( 650mm x 366mm ) 0
10 3836 x 1160 ( 974mm x 295mm ) 0
11 7500 x 2010 (1905mm x 511mm ) 0
12 7500 x 1360 (1905mm x 345mm ) 0
Thanks,
Regards