I do not have a Mac computer and do not use UltraEdit for Mac for that reason.
The feature backup/restore user customizations is most likely not available at all in UltraEdit for Mac if you cannot find it in any menu. This feature is also for UltraEdit for Windows just for backup/restore user customizations of same version of UltraEdit on same or a different Windows computer. I am quite sure from what I know about backup/restore user customizations that it will not work to transfer user customizations between UltraEdit running on different platforms (operating systems) or from UEStudio on Windows to UltraEdit on Mac/Linux.
You should be able to manually synchronize most user customizations by compressing on Windows the UEStudio application data folder
%APPDATA%\IDMComp\UEStudio into a ZIP file, copy that ZIP file to the Mac, extract it there in a temporary folder and compare the extracted folders and files with the folders and files in
~/Library/Application Support/UltraEdit.
Note 1: The directory referenced with
%APPDATA% is hidden by Windows default. Select
%APPDATA%\IDMComp\ in the browser window and copy it with
Ctrl+C to the clipboard. Click into the address bar of
Windows File Explorer, paste the path with
Ctrl+V and hit key
RETURN or key
ENTER to open the folder containing the application data folder of
UEStudio.
Note 2: The directory referenced with
~/Library/ is hidden by Mac default. See the instructions at
How to restore position of File Tree View in UltraEdit on Mac? how to open the folder in
Finder of Mac OS.