Encounter Builder

Is there a way to activate all book´s  that I own at once? If not it would be really helpfull

All owned and shared sources are enabled by default in the encounter builder. You need to actively select sources to limit what you see 

if i dont select books it keeps showing me every Monster even from books i dont have Aceess to 

Oh, you mean an owned content filter. I misunderstood based on the way you phrased it. My apologies.

There isn't currently. Which is REALLY annoying.

However, what you can do to save time in the future: select all of your owned content in the filter (one-by-one). After you have it filtered, bookmark the page. Now when you navigate to the page through your bookmarks, it should have saved your filters so that you don't have to select them all again.

It's a workaround, but it shouldn't be necessary in my opinion.