RH 2017 had a CSH Test tool that allowed users to test context IDs to make sure they had been added to the correct topics. Users opened the CSH Test tool by selecting Tools tab > Open section > Toolbox and clicking the CSH Test icon
Does RH 2020 have this tool or one like it?
Not that I am aware of.
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I was looking for that, too. I saw that tool described in a tutorial on YouTube about a version of RoboHelp that preceded 2020.
I would imagine that RH2019 Classic would have had it also (but not the New UI versions).