Trackpad selection option

Hi, I just recently upgraded my macbook and my previous one was several Operating Systems behind so if this option was changed a long time ago, sorry. I'm hoping that I can still get it back.

Anyway, my old computer (and I am 100% sure it was this way on this computer too when I first started it up but then when I altered one option on the trackpad it stopped working) I could drag the cursor to the corner of a window where it becomes the diagonal double arrow and double tap (I'm pretty sure with two fingers) and then it would let me resize the window. Also, when you are selecting icons on your desktop you could perform the same action and move the icons around. Lastly, I am POSITIVE I could do this when I first started my computer to move the icons to customize the control strip. (I can still do all these actions by force clicking the track pad and holding it while I move, but I don't want to do that)

Does anyone know what I am talking about and more importantly how to set it back up that way please? Thank you so much if you can help, it is a nuisance after so long of being used to the double tap to grab rather than the force touch to grab.