How many coins can you track at once?
You can pin as many coins as you like to your watchlist. The menu bar has limited width, so to show a long list CoinNotch uses cycle mode, rotating coins through one chip, or side-by-side mode for a few at once. The practical limit is screen space and readability, not a hard cap on your watchlist.
You can add as many coins to your watchlist as you want. There is no small fixed cap forcing you to choose just a few. The real constraint is not the watchlist itself but the menu bar, which has limited horizontal space, so the question becomes how CoinNotch displays a long list, not whether you can build one.
How a long list is shown
CoinNotch handles this with two display modes. Cycle mode rotates your coins through a single chip, one at a time, so the footprint stays tiny no matter how many coins you track, ideal for a long list. Side-by-side mode shows several at once for an instant view, which suits a handful of coins with room to spare. The cycle vs side-by-side guide explains how to choose.
In practice, the sensible number is whatever stays readable for you. Many people keep three to six core coins side-by-side, or a longer list on cycle. You can reorder the list so your top coin leads, covered in the remove and reorder guide, and the multiple coins guide covers building one.