Vector line layer classification with two functions in QGIS

Question

I have a linear geometry layer with the attribute: "uuid_przys". I would like to classify my layer with the uuid-attribute, but only for the objects in the current map view or for the objects that I select.
After classification I would like to have only 5 objects in the layer tree, that are actually visibled on the map:

Babel · Answer

You can use data driven override for Enable symbol layer to show only symbols for features that A) are selected and B) fulfill a certain condition (here: attribute value < 10) using this expression : is_selected( ) and  "value" <10.
Screenshot: for demonstration purpose, I added the original layer showin all features in white or yellow (the selected ones) circles; the duplicated copy of this layer contains the same features, bot only those which are selected and have a "value" smaller than 10 are symbolized with a small square and labeled with their "value":

If no points are selected, no features are symbolized. If you make a selection, only those of the selected features that fulifill the condition "value"<10 are shown:

Vector line layer classification with two functions in QGIS

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