I had a small 40 page logbook when I was a student that I used for all my training flights and for various signoffs. Once I started my job as a CFI, I knew that little book would fill up fast, so I just stopped adding flights to it. By that time I already had been keeping track of my flights digitally. Now whenever I need a signoff or training where an instructor needs to sign my logbook, I use that little paper logbook, but for everything else, I just use my
digital logbook).
So basically I have a "signature required" logbook that only has stuff where a signature is required, and a "every flight" logbook where I log everything.