I suggest you do a clean install of Brave.
You will need to use an app such as Revo Uninstaller, free version, to completely uninstall Brave then install the official version from https://brave.com/
Note: Reinstalling Brave will lead to the loss of your estimated earnings.
@PikachuandEevee2000 additionally, can you tell me if you installed Brave using any special promotion or if it was the standard install from brave.com/download?
I see - can you please disable this theme and then tell me if the option appears? Or simply select Brave default images in Settings --> Appearance —> Theme
Note while this may work, it will likely clear all data held in the browser. Can you please try and get the console screenshot requested previously before resorting to this?
I also notice that you still have that background enabled. I want to ensure that you tested removing the theme by going to Settings --> Appearance --> Theme --> Brave default images then relaunching the browser and checking.
From there, please click. on Brave default images and restart the browser. Then, check to see if the Customize menu shows the option to choose your own backgrounds:
well i found the way to solved, but maybe will not apply for you.
since im from Colombia i download and install brave but in Spanish , so what i did was uninstall brave, switch my pc (macbook) to english and try download and install again, after that the issue gets fixed for me