I am new to QGIS.
When I am using rule based styling, duplicates for some reason show all the matching symbols and not only the first match rule's symbol.
How do I make show only one symbol even if it matches more than one rule?
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Sign up to join this communityAs far as I know you cannot.
To achieve your result (not having overlaps of different symbols) you have to refine your rules to exclude this possibility. Such as:
"TOPO"=1 AND "COVER"<> 1
For your base symbol (Other), you should use the rule:
ELSE
Indeed, the way it currently works is useful if you want to superpose information or create more complicated symbolisation and legends.
And, just in case it helps, you can create a hierarchy in the rules, by dragging one (sub) rule over another. For example:
The "Diameter" > 250 rule here will only apply to the features in clay (but the symbols will superpose).