I noticed that my ram usage was incredibly high, so i turned on the ram limiter to 1.5GB (i have 8GB of ram so it should be ~18% usage) and yet opera was still using >40% of my ram

when i took the screenshot i had 3 tabs open, nothing running, and the ram limiter set, and it is still incredibly high, I installed this for the "low RAM usage" and am now questioning the legitimacy of that claim, can someone help me figure out how to get rid of all of the tabs that task manager thinks is there but the browser doesnt?