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I have a layer called 'A' with a field called "B", under this field, there are multiple values such as "C, D, E..." (one value for each row/feature in the attribute table). I have been trying to use is_selected() function in the rule, but I kept getting 0 results returned.

I am just trying to show the filtered features for a layer. E.g., only showing the features with "C" in Field "B" on the current layer, etc. Any ideas?

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    Maybe I don't get your question (why you are trying to use is_selected). If you are just trying to filter features in your layer, right click your layer in TOC, select 'Filter' and use expression e.g. "B" LIKE 'C'.
    – Ben W
    Commented Oct 20, 2021 at 6:29
  • Please, do not forget about "What should I do when someone answers my question?"
    – Taras ♦
    Commented Nov 5, 2021 at 10:46

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Let's assume there were two features selected in the polygon layer 'test'. Afterwards, the Rule-based symbology was applied using the is_selected() function.

main_1

When I unpick the category without the is_selected() the following result will pop up (which will be also true in the Print Composer)

main_2

However, IMHO the is_selected() function shows its real "power" in the Print Composer.

print_composer

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