Setting gain for measuring fluorescence

I am using a Biotek Synergy H1 microplate reader and the Gen5 software version 3.12.8.

I have been trying to measure fluorescence using the machine, but I am having trouble setting the gain.

The default shows <extended> gain and does not allow me to set it to a particular value. When I produce reports, it shows that the gain was zero and sometimes 100. How do I set it so that I can manually put the value?

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