Downgrade to 3.5.5

Hello,

Thanks for your continued efforts to deliver what was an excellent plugin.

I have recently upgraded to version 6.8. There are a few problems I have encountered with the current version:
1. The font colour of the title and check-boxes changes to red when the form is edited.
2. The form layout now uses an excessive amount of space on the website (and email submission), which is almost three times more than the earlier versions.
3. The field description now appears permanently below the field title. Earlier versions had a lightbox that appeared when customers selected a field. This was perfect.

How can I downgrade to an earlier version with those features without losing the form settings/particulars?

What is the reason that these features were removed? Can those features please be reintroduced?

Thanks.

https://ww.wp.xz.cn/plugins/custom-contact-forms/