There are too many browser history records. I'll tell you two ways to clean up quickly and make your mobile phone "slim":

1. please go to the browser APP > menu on the bottom bar > bookmarks/history > history page, select the record to be deleted, and click Delete on the left slide, or click Delete at the bottom, and select one hour/one day/all to delete the time period.

2. please go to browser APP > bottom bar menu > settings > clear data page, check "history" and click "delete" to clear all browsing records.

This answer applies to all OPPO models.