Ranks come from Roblox
If your Roblox group is connected, each member's rank is their group rank. That is the number Evalyn compares against when deciding what someone can see.
A member has one primary role — the one the group gives them — and may hold additional roles assigned inside Evalyn. Their effective rank is the highest of those. Removing an extra role puts them back to what the group says, rather than leaving them stuck at the boosted number.
Custom roles
Settings → Access → Custom roles is where you define what a role can do. Each role holds a set of permissions and a rank level.
Permissions are grouped by area — staff, sessions, shifts, moderation, resources, administration. The list is long because the product is; give out what someone needs and nothing else.
The promotion ceiling
A role can carry a limit on how high its holders may promote others. Without it, anyone who can promote can promote someone to their own level, and from there the hierarchy is decorative.
Set it deliberately for any role that can promote.
Access rules
Individual things — knowledge articles, document folders, categories — can carry their own access rules on top of role permissions. A rank floor on an article means people below it do not see it exists.
Approvals
With approvals switched on, certain actions do not take effect until someone with the reviewing permission approves them. Useful for rank changes in larger groups where the person making the change is not the person accountable for it.
Platform staff
Evalyn's own staff can open a workspace to help with support. When that happens a banner says so plainly, and every visit is recorded. They are not members of your workspace and are not counted as such.