My iMac and MacBook Pro have stopped being able to find one another.

I have been sharing files between my iMac and MacBook Pro. Recently they have stopped being able to detect one another. When I look in the sidebar of the Finder window, neither computer shows the other. I have file sharing enabled for both computers. This is a recent problem, and I'm not sure what has changed. I may have updated software - but don't remember what or when, as I tend to automatically do so when an update becomes available. I would appreciate any help that you can give.
Thanks,
Linda

Eric,
Thank you. I had all my settings right - I had checked and double checked. The one thing I had failed to do - which is the one thing that often helps - is to shut everything down and restart. I shut the router and the computers down and restarted them one at a time. They are once more talking to each other.
Thank you again,
Linda

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