FluentCRM Email Editor

I'm having some issues with the FluentCRM email editor, specifically with the vertical space between list items in a List block. The FluentCRM editor creates them double-spaced, and I need to get them to be single-spaced.

At the suggestion of Support, I've tried tweaking the Line Height, but by the time I get it to where the list items look single-spaced (about 0.4), then any lines that wrap start overwriting each other.

But the default WordPress editor on my site works just as it should, creating single-spaced list items by default (and you can tweak them with Custom CSS if you want in the Advanced section). It doesn't even have that "Line Height" parameter, but it works prefectly.

Is there any way to change the FluentCRM editor to the apparently more modern one used by WordPress? Or replace it in a future version with something more modern that works like the default WordPress editor? It looks like FluentCRM forked a version of the WordPress Block Editor from a long time ago, and it's difficult to work with in some cases.

By the way, I wanted to say thank you, thank you, thank you for FluentCRM to the developers and to support team and also to the community. This plugin and the supporting plugins like FluentSMTP are absolute game-changers in the WordPress ecosystem, there's just nothing else like them. Much appreciated, WP Manage Ninja, you definitely live up to the name!