I've not seen any need more than 'let system manage pagefile' on any of my 8 rigs, but if you want to increase go ahead,

WINDOWS KEY + BREAK
Advanced System Settings
Performance Settings
Advanced
Change
You can set as you wish, my 64GB SSDs don't have enough room for 64gb page files, but 12GB setting usually works great here.  I use 8GB of DDR4.