Hello,

1. Yes, we understand that it might work without the button. But currently, we don’t have such an option in our theme, unfortunately. We will consider this improvement for our future updates.

2. Please, send us your admin access so we can check what is wrong with the button.

3. Do you mean to hide the shopping cart widget from the header builder when the catalog mode is enabled? OK, we will review this for our future updates.

4. Off-canvas sidebar option directly depends on not from the device, but on the screen width of this device that based on Bootstrap 4 grid where 768px screen – is mobile screen width.
Here is screen width from which off canvas sidebar options is depending:
Off canvas sidebar for desktop – 1025px and up
Off canvas sidebar for tablet – from 1024px to 769px
Off canvas sidebar for mobile – 768px and below
The screen width of the smaller iPad (768×1024) in vertical orientation is too small to show full tablet content and in Bootstrap 4 it is considered a mobile device.

5. When you enable the catalog mode it removes the add to cart section completely. For variable products, add to cart button comes together with the variations form (swatches). Without add to cart button, the swatches would not work. And there is no way to remove the add to cart button for variable products with some PHP and not with CSS. Also, without variations form, you can’t switch between variations to see different SKUs set for particular variations. That is why you need to either set one SKU for the parent product or disable the catalog mode and hide the add to cart button itself with the CSS code.

Kind Regards