Hello,
As mentioned previously, the 'Save' button (which is called 'Finish' in this case) is not displayed at the top of the page, but at the bottom of it. Your screenshot does not highlight the entire page. You can see in my screenshot how it should look like.
In your case I can see that some assets were not generated as expected. This might be due to the fact that your store tries to load them via HTTP and you are using HTTPS or vice-versa.
Have you tried clearing the cache (both the PrestaShop and the browser one)?
If you open your console (Ctrl + Shift + J in Chrome), do you have any errors displayed in there? If so, can you post them in here, please?