The FX Browser will only show as one column. I have seen other users where the FX browser shows up as a list in multiple columns.
Here is the original thread for this issue:
https://forum.cockos.com/showthread....X+Browser+list
I have tried all suggestion provided by the users.
Attachment provided shows issues.
MBP Late 2015
OSX 10.11.6
Reaper 5.961