aviris

The theme editor allows me to select the font but some variations of the family don't work.
Also I was using a SF Mono Bold variation for a few days and now suddenly it doesn't work either. On the SF Mono Light/Italic work for some reason. This happens with other fonts too.

If we can't have the history forever, can we at least have it longer than 3 months pleaseeeeee?

I'm a long term Alfred user, but somewhat on-and-off-again due to my coming in and out of using macOS.  I'm now back in macOS and hopefully for a good while now.  And I signed up at this forum specifically to post this feature request, which has been one thing that's bugged me about Alfred's Clipboard feature since I first stated using it in 2012 or so.
 
On Windows I use Ditto and I have my expiration set at 12 months, but that was only for space considerations as  Ditto doesn't have Alfred's ability to give different time limits to text versus image data.  If it did, I would set Text to "forever".
 
Why not use snippets?  I do.  But the point of the forever history for me is to retrieve things I didn't know I needed to make a snippet.  "What was that long command I ran on server X last year? I can't access the server but I know I copied it at least once.. it started with.. <SEARCH> that's it!"   This doesn't happen every day, but it does happen periodically.  I've pulled long-ago copied data out of my Ditto clipboard history many times.  Sometimes I even need to browse through dozens of results, eg if I'm looking for a phone number I thought I'd only need once, and all I have to search for is the first two digits, 07.  But I can very often work out the right entry by looking at the date it was copied.   
 
The important thing is that I have the option, and in practice I've found it very useful.  I don't want to have to think, every time I copy something, "should I make this a snippet just in case I need it in 9 months?"  And more often or not I have no idea that I'll need it again, until I do.  I have my shell history (Bash and ZSH) set to never truncate for exactly the same reason, and that is regularly invaluable.
 
Beyond that, I honestly don't understand the reason not to add the option?  The default will always be low; 1 month or whatever it is now.  Only people who actually want longer need set it, and as they have the flexibility to only do so only for Text, there's really no space worries.  
 
So I have to say I find it surprising and a little disappointing that there appears to be so much resistance to implementing such a simple feature.  Lots of people are asking for it.  It's surely easy to do.  And it need not affect anyone who doesn't want it.  Why not put it in?
 
If there's some technical limitation - Alfred gets really slow when there's too much history, perhaps?  - then just put a warning up and let us take our own chances with it.  But if you're using SQLite or similar I really can't imagine there'd be a problem - it's certainly not for Ditto, which searches a huge DB just fine.
 
At the moment I am regularly checking every new clipboard manager that I discover to see if it can replace this part of Alfred, and give me the forever history that I want.  I just wish I didn't need to and could forget about it and just always use Alfred, which is perfect in most every other way.
 
Thanks very much.

@Sane You can clear your entire clipboard history by typing "clear" in Alfred's main search box and choosing whether you want to erase the last 5 minutes, 15 minutes or all of Alfred's history.

Alternatively, you can clear single items with Fn (Function key) + Delete (backspace key).

With regard to non-default fonts, Alfred could do what CSS does and allow you to specify a list of fonts, and fall back to a built-in font if none of the specified ones are found.

I like the blur effect, so I hope it doesn't go away (not that I'd moan to you about it). I'm curious where the font choices are coming from? Is there any possibility of dropping selected fonts in a certain location that Alfred could use? Menlo is easy to read, but I'd like to experiment with other fonts. 
 

Click screenshot to download .alfredappearance file.