There's a table within the INI file (tcw24_xml.ini), that isn't available to the public, that contains that option.
I looked in the other files in the Built-In folder (that I could read) and there was nothing there in reference to the Most Recent Use list. I tracked this table down in an old Version 9 INI file; last version before they switched to a compressed INI file that I can't open/read.
The "History" window in the "File / Open" dialog will display up to 50 drawings, but there's no way to change that to a compressed list. They have a "Force Album Thumbnails" that can turn the thumbnails off, sometimes, but leaves a large empty space between file names. Maybe Softdev could put the "MRU_OPT" in the "Option / Preferences" dialog.
V17—V21, 2015, 2016, 2017
Designer, Deluxe, Expert, Basic, Platinum
Windows 10, 64-bit