And then also tick the setting update on the settings page.
It works:
This is an issue with that theme object setting type - Save doesn’t really save until you finally hit tick 
Are these the green parts in the two screenshots above? I have saved them.
It still hasn’t taken effect.
Logically, it should have worked? There doesn’t seem to be anywhere else to modify.
you must press the tick.
unfortunately this is a usability issue with this setting type.
Now refresh the browser.
Still invalid, the modified content is not displayed.
Do I need to provide you with other information?
Yes, I did check it, and I can ensure that my steps were not wrong.
Internal save and external check.
I tried again, and even deleted the first item, but the card for this item is still there.
The editor information has indeed been modified.
No, logically it should not have worked.
I believe you are showing the “discovery” route, but you have specified “homepage”
Bars supports multiple routes, unlike RSB.
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Oh my god, I was so stupid that I didn’t notice I had been modifying the homepage all along. I apologize for wasting your time.
Thank you very much.
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the naming is confusing, “homepage” is supported, but this relates to “custom homepages”.
usually the normal homepage for a discourse instance is “discovery” - this is a historical thing.
The OP information may be slightly out of date, apologies.
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