Hello there,
You may check the options under Display-->Resolution, where the default setting is Default for this display.
But there are also many other options to choose from to optimize the resolution of your remote connection. If you scroll to the bottom, you can even "Add Custom Resolution.
Windows defaults to 96 d.p.i. while macOS still assumes 72 d.p.i. You can change a Windows machine's resolution (though it doesn't look as good), but not a Mac's. All remote software runs on the same basic technology, so you could try different Mac clients to see if you can get a better result.
Hope this resolves your Query !!
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