First, tap the search icon (a magnifying glass) in the top right corner of your screen. Then type out the relevant keywords and hit Search. Next, touch the filters icon (two lines with circles on them) to the right of the search bar, turn on the Watched videos toggle switch right at the top, and hit Apply. This will change your search results to focus on videos you watched in the last seven days.
For example, I searched “find recent video” in an effort to find the video from content strategist and TikTok tips-giver @lateilla that initially clued me into the fact that this was even possible and got me digging deeper into the app’s search function. The December 21 clip wasn’t in my unfiltered results, but it showed up fairly quickly when I set the filter.xxxxxxx
Source : https://www.popsci.com/diy/find-recently-watched-tiktok-videos/