I have big challenges to get the designer to look correct on my WooCommerce shop.

The theme is Astra, and as you can see in the attachment, it appears strange.

I have tried setting it in the settings, but without success.

Can you help? Tried to see and read your guides without success.

Hello, you need to adjust the settings of your theme because the FPD is compatible with this theme too. 

That wasn't much help :)

Your guides in here are not working correctly.

See attached.

Here it is set to "page" display, but does not have the option to put it under the short description. Otherwise, there is no possibility to write a text explaining what they have to do.

At the same time, the size box in the right corner is unnecessary - Can it be removed?

If you're still facing that issue, you can open a support ticket:

https://support.fancyproductdesigner.com/support/tickets/new