Give each watch order a name. One show can have several (e.g. a "chaos" order and a "chronological" one). Install the link once — add or rename orders any time and they appear on every device (reopen the show to refresh).
Bookmark this page — it remembers you on this device. Anyone with this link can view/edit your orders, so keep it private.
Your collections
Each collection is its own row in Stremio. Drag orders to reorder them or move them to another collection, and drag ⋮⋮ to reorder the rows. Click an order to edit its episodes.
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Heads up: Stremio saves an addon's list of rows when you install it and doesn't check for changes, so new, renamed or reordered collections won't show up by themselves (restarting doesn't help). To see them, remove Custom Watch Order in Stremio and add it again with your install link above. Your orders and watch history stay. It will move to the bottom of your addon list though. Adding, editing or moving orders between existing collections shows up without any of this.
Add a new order — pick a show
Add a movie — appears as its own card in a collection