Hello Duncan

A website or prtscrn might help (website is better) but I will givi it a try;

1 a; check style button on the object (alignement/margins)

1 b; are there objects beside the central picture that are bigger then it will be filled up automaticly and you may get a gap. (set the objects to same height in that case)

2 you mean footer menu? template -> text style -> select footer menu, set it to off (TAG visible option off)

3a, why not, is the template too small ? Check for every viewport ( I am geussing you have responsive on) in

template structure (step2 template  customization), you will find 4 template viewport each with there own colour, you will see these colours back in the preview. select the footer for the viewport you wish to enlarge, set a bigger height, then hopefully it fits)

or

3b. does the object not respond can't you select height of text? remove object and set it as a text object in the footer. When converting v13 makes them all images, this is needed cause the different ways v12 and v13 work.

Try also to use the help (F1) and use the convertion help:

https://helpcenter.websitex5.com/fr/post/154023

sorry made a few adjustements after I saw the webpage....

Best Regards

Andre