On the Mods page, the On this server tab is your mod load order: drag a mod up or down, or type its new number. Folders only group the list for you to read, and a collection is a saved copy of the list (a preset) you can put on any server. Every change applies at the next restart.
Change the load order
The order of the list is the order of the mods array in config.json. The page’s own note puts it this way: a mod loads after the ones above it and wins where they overlap.
- Open your server, choose Mods, then On this server.
- Drag a row by its grip handle to a new place, or click the number at the left of the row, type the new position and press Enter. Typing a number works on a phone.
- Restart the server.
- Load order note
- Type a new position
- Load order and Folders
The note (1) explains the order, the number box (2) takes a new position, and the switch (3) changes between Load order and Folders.
When you add a mod, the panel puts the mods it needs directly above it so each loads first. Keep that in mind before you drag a mod above something it needs.
Dragging only works in the Load order view, and not while the search box has text in it. The number box works everywhere. To find a mod in a long list, type part of its name or ID into Search by name or ID.
Group mods in folders
Folders are a way to look at the list. They never change the load order or config.json.
- Switch the list from Load order to Folders.
- Choose New folder, type a Folder name (up to 40 characters) and choose Create.
- Tick some mods and choose Move to folder, then a folder. New folder with these makes one and files the ticked mods in it. Out of their folders takes them out again.
- Use the three dots beside a folder to Rename or Delete folder. Deleting a folder leaves its mods on the list.
You can keep up to 30 folders. They are saved as a setting for you on that server, not in the server’s files, so they do not change anything for the game.
Lock a version
Tick mods and choose Lock to installed versions to pin each one to the version already on the server, or Follow latest to let them update at each start. Mods that are not downloaded yet have no version to lock and are skipped. Each row also has its own version menu.
Save the list as a collection
A collection is a named copy of the list. Use it as a preset to swap between mod lists, or to copy one server’s list to another.
- Open the Collections tab.
- Under the heading “Keep this list of 6 mods as a collection” (the number is your mod count), enter a Name and an optional Description (optional).
- Under Who can use it, choose Your organization (only your organization sees it) or Everyone (every panel user can find and use it, and only your organization can change or delete it).
- Tick Include the scenario to save the server’s map or mode too. Tick Lock the versions installed now to save the versions on disk.
- Choose Save collection.
- Name and description
- Who can use it
- Save collection
Fill in the name (1), choose who can use it (2) and press Save collection (3).
An organization can keep up to 50 collections.
Put a collection on a server
- Open Mods on the server you want to change, then Collections. Use Search collections to find it.
- Choose Add to my list to keep your mods and add the ones that are missing after them, or Replace my list to make the list exactly the collection.
- The dialog says how many mods will be added and removed. If the collection has a scenario, tick Also switch to it if you want that too.
- Confirm, then restart. Nothing downloads until the next start.
That is also how you copy a mod list between servers: save it as a collection on the first, and choose Replace my list on the second.
By hand
The list is game.mods in config.json. Order the entries, save and restart. Copy the mods array to another server’s file to copy the list.
If it does not work
- You cannot drag. You are in the Folders view or the search box is not empty. Switch to Load order and clear the search, or type the number instead.
- The Save collection form is missing. The server has no mods yet, or you do not have permission to edit files on it.
- A mod you removed still loads. Another mod on the list needs it, so the game still downloads it. Remove the mod that needs it, or tick the option in the removal dialog to remove the mods that need it too.
- The server will not start after changing the order. Put the list back, or follow find the mod that stops your server.
New to mods? Read how to install Arma Reforger mods, or see Arma Reforger servers.
Sources: Bohemia wiki: Server Config