How to make inherited parameter value in start job visible?

Hello,
there is a great feature to set parameters for a process to run in Orchestrator → Jobs → Start Job → Parameters.
But the sad thing is that I cannot see preset variables. (see below)

I would like to set it e. g. to:

2019-03-06_152951a

just to see the preset value. And ideally where is the value inherited from - but this is a subsidiary information for me.

Am I able to do it?

click the edit button buddy… @Ondrej_Macek

Really? I clicked the Edit button as you told me. Where should I see the inherited value??

I am asking to see it not how to set it.