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There was never another menu to change the page file extension. You always had to do this in the page properties.
This behavior has not recently changed. It has worked this way since version 1.0

You can drag & drop other elements insde a table cell, so for example you could add an animation to a heading and place this insert the table.

I have a feeling that it may have had something to do with me not saving the project before it was published. That should not make any difference. Is there any way that a warning could be given if the project has not been saved before publishing? There is currently no option for this. But you can p...

Note that this is not specific to WWB.
But maybe this will be helpful?
https://en.wikipedia.org/wiki/ISO_8601

If you need further assistance then please share a demo project and describe the exact steps to reproduce this behavior.

But as mentioned, if you use lot of images then lots of memory may be allocated because to be able to display the image then need to be loaded and decompressed in memory.

Maybe you have enabled the 'Restart Manager' in Tools -> Options -> Backup ?

Note that if you use many images then this may require lots of memory. Of course, this is not specific to WWB.

It looks like there is a problem with the file:
editablecontentadmin.php

Does you webhost support a recent version of PHP (5.6 or newer)?

Did you publish all files?
jquery-3.6.0.min.js is missing on the server.

None of the links work for me.
Are you sure they are correct?

Maybe the input field is not part of the form?
It is difficult to help you without seeing what you have done.

Correct, the master frame itself does not need to be published.

Je kunt rulers guides toe voegen door deze uit de ruler te slepen of handmatig invoeren via 'Add horizontal/vertical ruler guide'.

You can use the built-in form script to store data in a CSV file.

View -> Rules guides

Note that this has nothing to do with WYSIWYG Web Builder. This is standard HTML functionality.