Classically, because the terminal is a grid of equally sized characters, only a single text size was supported in terminals, with one minor exception, some characters were allowed to be rendered in...
Kitty can do multiplexing over ssh as well. If you have kitty installed on the remote, you can use Kitty’s builtin ssh wrapper and get a lot of useful features.
As a non-user of kitty, why did it make you drop tmux? Don’t they do different jobs?
Kitty has multiplexing built in so it can also replace a lot of what tmux does (unless you’re using tmux over ssh)
That exception is my primary use case for tmux, so that explains it.
Kitty can do multiplexing over ssh as well. If you have kitty installed on the remote, you can use Kitty’s builtin ssh wrapper and get a lot of useful features.
https://sw.kovidgoyal.net/kitty/kittens/ssh/#opt-kitten-ssh.forward_remote_control