Hey! It’s a little baffling that it is not possible to adjust the character spacing for menu text in the basic editor. Has anyone found a way around this? This is weirdly a deal breaker for me so any magical solutions here would be lovely 
If you are talking about the menus from within the Wix Editor itself, then you are best suited going through Wix Support for more help with features from within the editor.
https://support.wix.com/en/about-wix/contacting-wix-support
Note that this forum is for all code related issues on your site and not for any general questions about the editor, that should go directly to Wix Support or you should read their support pages about using the editor.
https://support.wix.com/en/the-wix-editor/menu
If you want to have complete control over a menu for your site, then make it yourself and use Wix Corvid to help you.