Blueprint - ScreenPercentage 200 while taking screenshot

Hello,
I would like to start a game with default Screenpercentage 100, then when I click a button switch to Screenpercentage 200, take screenshot and then back to Screenpercentage 100. So, when I play 100 is enough and it costs less, but getting high resolution screenshots.
I am newbie in BP, and trying to get it working.