setting record volume

How do I set the recording level and the mix down level?
I’m using 2.3.3 in Linux mint cinnamon 20.3 Audacity was installed from the store

That depends on your set-up.

What are you recording?
What are you recording with? (example: a Rode PodMic, connected via a Focusrite Solo USB)
Which version of Audacity?
Any other relevant information.