"Find in files" pane does not show a search box in Ubuntu 20.04 LTS

I'm running RStudio 1.4.1106 for Ubuntu 20.04 LTS. When I open the "Find in Files" pane---either using Ctrl+F6, or View -> Show Other Panes -> Show Find in Files---I no search box appears. If I click on the "Replace" button at the top right, a "Replace with" box appears, but no search box. Please see the attached screenshot showing what I see. How do I get a search box?
Apologies if this is the wrong forum or place to be posting to, or if this question has already been addressed elsewhere; I was not able to find any reference to a similar problem.


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