Different rules?
 

When i want to create rule i have option "From", but some rules has "From email address...".
When i want to edit older rules, i have sometimes visible only conditions and button "continue", but some rules has all "then" properties...
What is going on? I cannot understand ...

When creating a new rule in the UI just click the "switch to no-preview rules" and you can then create a rule with the full set of conditions like you used to. Rules that you already had are considered created under the "no-preview" mode so editing should the way it was before (i.e., you will see both the "if" and the "then").

IMO the "new" "standard" rules stuff is limited to what searches can do which IMO don't make for writing exact matches for conditions. Also if you do create a rule this way there's no way to switch it to "no preview" mode in the future. You would have to create a new "no preview" rule.

I assume the "From" test looks at the whole of the From: header, but "From name" allows you to look at only the name part of the header, and "From address" only the this@that part. So if an email has

From: "Fred Flintstone" <fred@rocks.com>

you could test the whole string, or just the "Fred Flintstone" part (the name) or just the "fred@rocks.com" part, I think.