This is a known bug (missing Tester folder in new installations), see here how to fix. https://www.mql5.com/en/forum/306305

Input values being reset when switching tabs.
- 2019.03.11
- www.mql5.com
Hi everyone :), I've currently got a freelancer working on an EA for myself and there's one strange bug that I can recreate but they are unable to...
Thank you very much

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Hello
I am a user of MT4 and just decided to use MT5
the problem is that in MT5, when trying to modify parameters in the input tab when I switch to an other tab and come back to the input tab all the parmaters are systematically reinitialized...
How can we sort this out?
Thank you very much for your help!