The first is a hands-on-practical walk-through with planning and considerations then the subseqent implementation of a samba fileserver from scratch.
The second is informative topic on various troubleshooting and setup
The third you must be familiar with as this is the goto source for Samba on Manjaro
- General Samba - ArchWiki
If I understand your topic correct - you are looking for at method of graphically sharing a user folder on your system - preferably using Dolphin → rightclick → share?
And you have read the Arch wiki on usershares?
- ArchWiki User shares
The output from 'testparm* you showed earlier looks like you have copy-pasted some smb.conf found on the internet. This is usually not a good idea as you should only add options to your smb.conf which you know why you need.
Samba has a boatload of various options - of which you will ever only need very few.