GUI

1. UI stuff is saved to the QT config file, not config.yml.
2. Not without editing the game PARAM.SFO itself.
3. Check if settings are saved after you save and then close the emulator.
4. Check if settings are saved if you edit it before opening rpcs3.exe.

Hi and thanks for taking time to answer my queries  

1. Would you please clarify exactly what this file is and where it is located. I created a UserStyle.qss file and all settings are saved within it but when I select this to be used from within the options dialogue of RPCS3, then click Save, when restarting the app, it reverts to the default theme. The issue seems to be that there is no setting within the CurrentSettings.ini to tell the emulator what theme to use so it just keeps reverting to it's default.
2. I notice there is now a R-click option that allows you to rename an item in the GameList. But on restarting RPCS3, all these are lost and revert to default names.
3. Settings are saved but closing the emulator reverts the settings to their previous default settings. For example, removing columns is saved within the CurrentSettings.ini file showing: visibility_column_serial=false. Closing RPCS3 is fine, but on restarting it, this changes the setting back to true.
4. See #3.

I have tried various ways to see if there's some way that works. Changing the ini before and after closing the app. Changing settings directly within the app. The trouble is that it seems certain settings are getting reset upon restarting the emulator.

Thanks again for your help.

EDIT:
System upgrade
Win10 x64, i7-8750H, 16GB RAM, GTX 1060.
rpcs3-v0.0.6-8071 Alpha [2019-05-05]_win64

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Ah, I found out that the way to save columns is to change them, go to options and save the current settings as a new file!
Why can't we use an existing file and just update it?

The way this works is understandable, allowing users to have their preferred setup, but realistically, how many users use the same PC? It just makes using the settings dialogue confusing imho.