Hi @syhrh ,
You can create a flow which runs on selected item.
Want to know more about it follow below link.
https://youtu.be/8MSGwXazZRM
In that flow you can add your action to change the status from approved to cancel.
Once you build above workflow, user can go to the list, select the particular item and select the workflow to run, which will cancel the request.
Thanks,
Vivek
If this post helps answer your question, please click on “Accept as Solution” to help other members find it more quickly. If you thought this post was helpful, please give it a Thumbs Up.