I cannot reproduce this on an iPad on 13.4.1 in Chrome or Safari.

Can you please provide more details/screenshots/reproduction steps of this issue with the new theme picker?

Here's what you need to do to reproduce it:

1. Clear the cache of your Safari browser, so that no theme is loaded yet, this is very important because the initial loading time will cause the problem

2. Click on the theme button, if your cache is cleared then no option is selected, which you might want to also fix by selecting a default theme
   

3. Click on a theme, then try to change it, you should get this extra overlay to the left
   

Thank you for the additional details. I'm able to reproduce the issue with not having a default theme selected in the drop down after clearing cache.

However, I'm not able to reproduce the issue with the blank overlay on my iPad. I'll have to try an iPhone emulator.

Yeah that's why I put at the beginning of this issue that it only appears on mobile devices (iPhone 7, iPhone X, Chrome, Safari). I don't have a tablet to test but on iMac or MacBook it doesn't happen.

I just reproduced on the xCode Simulator on my iMac, so you should also be able to debug it using the Safari Inspector.

I cannot reproduce this issue for v18 on an iPhone, so I'm closing this issue