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Is http(s) necessary?

I wanted to test to see how my site looks on different browsers using online tools like https://responsivedesignchecker.com. But, in every case and on all testing sites, my site would not display (I tried about 8 sites).

One of the test sites threw up the following error:

The website that you’re trying to view on Responsive Checker is not 100% accurate because it has X-Frame Options set to Same Origin or Deny. This isn’t great for the tool, but it is a great thing for a more secure web

I then noticed that when I copy/paste my website address it has no www but it does have https and a forward slash at the end.

https://eventsimo.com/

I thought the ‘s’ was only necessary for a payment page, not for every single page of my site?

I haven’t changed any of the default Bubble configurations, but I wonder if the way my site is configure make my SEO less effective?