Unity – How to Reorder Application Search Results

Unfortunately there's no easy way to customize lenses, people need to write them. On the plus side they're easy for people to write, for example the Ask Ubuntu lens is about ~350 lines of code.

Please add your idea here; I'm constantly on the lookout for people to write lenses so put down some detail on what you'd like to see in the lens and maybe we'll get lucky and find someone.

Why is it showing up as first result on search with "calc" and not with "cal" or "ca"?

That is because until you write calc it is sorting alphabetically, when you write calc there will be a program that contains the full word (LibreOffice Calc) so that program will jump to the first position on the list, its called a hit.

We can then assume that the dash search will look first for possible matches and sort them alphabetically if none matches the complete query and display hits always on the first positions if it found a matching word.

How to prevent LibreOffice Calc to show up as first result without removing it completely from Unity?

Has for the first part of your question you should look at

• How to remove icons/shortcuts from Unity menu?

it explains how and why you cannot simply remove a search result (with a possible workaround for it).

There is no way to just hide one single application without removing the global shortcut for it (even tough you could still have that shortcut on the Desktop for example).