@Atikan_ Of course there is a way.
Go to the drop-down menu where you can find your profile, under your name there is manga and "follow".
Click on "follow", next to "Latest updates" there is manga.
Click on manga and it will appear among the various "completed" options.
Click on "completed" and you will see all the manga that you have popped up as finished.
If it is not clear, tell me that I put the screenshots of the various steps.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)