You can try the latest version of logseq-randomutils-plugin.
Highlight the blocks, and activate Command Palette using “mod+shift+p”, and then type “Format Text”. Make the necessary changes as you require.
Thank you! Unfortunately, the utility doesn’t seem to work on my end. My app froze after I selected “Format Text”, and I couldn’t click on anything. Would it be possible to share a screen recording of how it works?
Replying to you, because your plugin may be the best way to do it if this isn’t something that is already doable…
Along with headings and things can you change the background color of multiple blocks at a time?