I'm just using one of the gallery options offered by default, not a plug-in. I'm not really too sure if that's linked to the style template I use or if it's just a generic option.
It's not my default gallery, but I just realized that I'm self-hosted and you're on Wordpress.com, so maybe they have a different default gallery. Can you try to find the exact name of the gallery, and I'll search for what the wp.com default is? I like it a whole lot better than my own default gallery and the gallery that I installed.
As far as the differences between the L1 and the P, I'll steal from my own blog post:
The L1 is a V-series Canon RF body derivative, placing it one generation before the P. There are a few differences in detail, but the bodies are dimensionally similar and the controls are laid out essentially the same way on both. Instead of the P’s fixed viewfinder with multiple framelines, the L1 has an adjustable viewfinder with settings for 35 and 50mm lenses as well as a magnified setting designed for precise focusing. Where the P has a single shutter speed dial, the L1 has the older arrangement of two dials, one for high speeds on top and one for low speeds on the front. The shutter speed dial on the L1 also rotates, whereas the one on the P does not. The frame counter on the L1 counts down and requires manual resetting, while the P’s resets itself when the back is opened and counts up. The P has steel shutter curtains while the L1′s are cloth. That’s about it for the differences – they are fundamentally very similar cameras.
I'm sorta kinda in the market for another rangefinder, and I loved the 5 seconds I spent with your L1
But it seems P's are more common, at least on the 'bay, and there are some L1 features I like (adjustable for 35 & 50, and the zoom preview), but also some P features I like (exposure countup, one shutter speed dial, steel shutter curtains), so I'm not sure. The zoom focus preview is pretty amazing though...