I don’t own Multitool but this thread suggests it only works with certain themes:

Also there is this post from their website:

• Why when I launch RWmultitool I don’t see any theme in the theme list of RWmultitool?
Probably there are no editable themes in RapidWeaver folder. Please, make a copy of a Default RW Theme or install a Third Parts Theme.

RWmultitool opens only the Themes placed in the folder named:
/library/application support/rapidweaver in RapidWeaver 5 (RWmultitool for RW5)
/Users/youraccount/Library/Containers/com.realmacsoftware.rapidweaver6/Data/Library/Application Support/RapidWeaver/Themes/ in RapidWeaver 6 (RWmultitool for RW6)

If you want to edit a RW Theme you must first make a copy of it inside RW (Theme Drawer) or place a downloaded third parts theme in that folder.
Note: If you cant see any theme installed in the theme menu, enable “view all themes” check.

The file location is for RW6 but you could try the same process for RW 7

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