Ah, unawares, you entered one of the hornet's nests here on TG!
There are various strong opinions on this subject and I have taken the occasional 'beating' for sharing a so-called 'hack' to address the issue you are experiencing.
I also have a strong preference for the light UI and am happy that I can still set up my custom bars etc. and use it. This is how you can do it: customize your setup using the dark interface. Once you're done, do not use the ctrl-shft-alt-S combo but close the program and go to "C:\Program Files\Xara\Xara Designer Pro X11" (if you’re using the 32-bit version you have to go the “Program Files (x86)” directory) and locate "xaradark_theme.xml." Make a copy of the file and save it in a different directory (this is only for safekeeping) and change the name of the file anyway you like (I added "OUT" to the file name -- again, this is only for safekeeping). Now start up the program again. It will show the light-gray, default interface.
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