You can see contacts and groups (maximum of 5) on the "Frequently contacted" section of the "Forward to..." screen (you can see this screen when you are forwarding a message).
If you do not want to see anything listed there, then you can delete them.
This one is the concept here: Clear the chat of the particular contact or group that you want to remove and automatically that contact or group will no longer appear in "Frequently contacted" section.
It is a simple task, and you can do it in two minutes. Let's see how to do this task.
Delete Frequently Contacted Contacts and Groups on WhatsApp
That is all. The chat is no longer under the "Frequently contacted" section. Do the above steps for all the remaining conversations that you want to remove.
Try it out and let me know how it goes in the Comment section below.
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How to Delete Frequently Contacted Contacts and Groups on WhatsApp