always on light while training?

Hi

I'm switching from a suunto 9 baro to fenix 6x :-)

In my suunto while on activity I can easily turn on the screen light forever. I use a lot training only when I train in the night

In my fenix I know that I can turn on gesture/altert/button before the sunset while on activitybut there is no option to be always on before the sunset.

It is possible to do what I want using some trick while on activity?

thx!