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A floating layer is full width so center it will not make any difference.
If you want to center content of the layer the set the alignment in the layer itself.

Also, why are you using a floating layer?

Maybe the project uses extensions which are no longer installed?
Make sure you do not save the project and stalking the extension before you load the project

I have checked it and it works for me.
Do you mean the built-in conveyor belt slideshow?
Do you have Windows 10? Because webp only works in Windows 10.

The sitemap URL is:
https://www.directoriomedicodeelsalvado ... itemap.xml

The 'Structured Data' object is available in the toolbox and insert menu.

Do you mean the built-in conveyor belt slideshow?
It seems to work correct.
Do you have Windows 10?

Most of your layout is using layout grids (flexible layout). However, the form is using absolute positions (fixed layout). So, that is why it has a fixed position. To make you form part of the flexible layout, it also needs to be built with layout grids. See also the FAQ "Can a form be added to the ...

For fixed/absolute layouts, you can use layers. To adapt the layout for smaller screens you will have to add breakpoints and rearrange the layout manually. For flexible layouts, you can use layout grids. In most cases, the layout will be automatically adapted for smaller screens. Related tutorial: h...

Please see this related topic:
viewtopic.php?f=24&t=91785

See this related FAQ:
viewtopic.php?f=10&t=22937

Step 1
Copy / paste the grid

Step 2
In the Object Manager drag the new layout grid to the 'video' grid (below the last child item)

I'm completely baffled as to why the index and About pages work correctly but all the others don't!!

Did you republish the pages?
Do the pages look correct when you do a local preview?
Do the pages look correct in the workspace?

what would you recommend as the minimum breakpoints to use? I recommend to use few breakpoint as possible. The key is that you need to add a breakpoints if your layout 'breaks'. In other words when the layout no longer fits within the viewport. Usually two breakpoints (for fixed layouts) is enough....

In object 'Menulayer' you have added invalid custom code.
"inside tag" can only be used to insert attributes. If you add other tags then this will break the structure of the HTML.
Please remove

If you look in the Object Manager then you will notice that the layout grids are nested.
The layout grid with videos are nested within 'Videos'
So, if you insert a new grid then you will insert it at the same level.