How to switch my Acer Aspire ES1-533 to accepting 5GHz connections?

I have a new router, a EE-Hub router and it supports both 5GHz and the usual 2.4GHz. My old router was also an EE Router but it had 2 different signal connections, separate 2.4 and 5GHz connections.

My Laptop seems to favour the 2.4GHz connection and wont connect to the 5GHz one, and I want to know how to do it manually.
I found out that this is possible through the Device Manager, by going onto your adaptor and making it accept 5GHz connections, but I see no way to do this manually. It only gives 2 Options, "Auto" and "20MHz Only", and I'm assuming that the second option isn't the one I'm looking for, without attempting it and breaking something.

So I wanted to ask, is there no way to make it take the 5GHz option? On my router's online menu I can see it's connected to the 2.4 one, the one that is not as good.

Any help?

Thanks in advance.