Same glitch happens for file format.

Are you sure it's multiple_select.html which renders the tags(keywords) in your screenshot?
I see the same problem when using tags but multiple_select.html is not used, text.html is used.
However editing text.html to remove form-control affects all normal text entry fields.
The solution seems to be adding a new form_snippet, say tags.html, which is a copy of text.html but without the form-control class, and referencing this form_snippet in the preset.

(No comment on the file format issue, I've not tried it yet)

I found this problem in tags first, but I had to fix it on text.html too.

This also seems to be an issue for resource_format_autocomplete

@frafra What did your schema look like for this? Did you resolve the issue?

@LukeTully I just removed the class from the template manually as workaround.

Note guys, we also have experienced this issue.

We have solved this and other problems by adding a custom CSS.

.form-control {
padding: unset;
}

.control-full input, .control-full select, .control-full textarea {
height: 34px;
}

.select2-container{
height:auto;
}

Can we evaluate this CSS in the core?

This bug has been fixed.