@CavalloneChen Recently Viewed items can be sorted by Date Modified. However, since you need to manually modify the item to be listed, which is a hassle. Good news is this can be automated. You need to use the Zotero Tag plugin https://github.com/windingwind/zotero-tag/releases There you can set the rules to add tag on item open say, "open tab" and remove the "open tab" on item closed. Now the item has been modified and viewed recently.
Upgrade Storage
There you can set the rules to add tag on item open say, "open tab" and remove the "open tab" on item closed. Now the item has been modified and viewed recently.
We'll be adding a proper Recently Read collection soon.
There's no reason you should have to modify an item for it to show up as viewed.
Are you referring to zotero-tag functionality?