Default double spacing with enter key

Operating system

Windows

Joplin version

3.5.12

Desktop version info

Joplin 3.5.12 (prod, win32)

Device: win32, 12th Gen Intel(R) Core(TM) i5-12500T
Client ID: a580ec1dada045eba958677549612634
Sync Version: 3
Profile Version: 49
Keychain Supported: Yes
Alternative instance ID: -

Revision: 449555c

Backup: 1.5.1
Freehand Drawing: 4.2.0

Editor

Rich Text Editor

What issue do you have?

First, I don't know which editor I'm using or how to find out. As for my question, I looked at former discussions on this topic but I'm following up to see if there is a resolution to this issue: when I press enter, I get 2 line breaks instead of 1 line break (i.e. I get a paragraph break). I want to have the enter key move down 1 line, not 2, without pressing shift-enter. Also, can I fix existing notes that I recently imported that used to be single spaced and were converted by Joplin to double spaced? I want to fix them in bulk/automatically since there are a lot to fix line by line, note by note. Thank you.