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You are trying to rename a field created by a table join. You can't rename a field there - go to the joins tab an make your changes there (for Custom field name prefix, if you have defined any) or in …

You did not state where and how you create the circles, but from the description I guess you use the size assistant. Simply set the output value to 0 as well, not just the source value: Other method …

To generate a comma separated list of all categories, you can use this expression: concatenate_unique ( "landuse", concatenator:= ', ' ) You might want to add a condition like if ( "id" = 1, [express …

In the Element properties go to the tab Label settings and deactivate the checkbox Allow truncated labels on edges of map (see screenshots below). If that doesn't help, check if you have activated Sho …

Define a custom variable containing the expression you want to use for filtering layers. Then for each layer, use this variable as condition if the layer should be visible or not. When you change the …

In the layer styling panel, for Fill color, use data driven override > Edit and insert this expression (see below for color values from a separate table): case when NAME = 'Spain' then '120,34,25' wh …

This means the joined layer is not editable. First export it in an editable format (shapefile, geopackage).

There is even a direct way to create a new field in your layer, without the workaround of using Distance matrix. Let's say you have a layer points with many points and a layer center with just one poi …

I suppose you did not save the output of the distance matrix: it's a temporary layer, right? Replicating your workflow, I encountered the same problem as you as long as the layer was a temporary layer …

Indeed, I had the same problem with the line you provided. To solve the problem, right click the layer, select export / Save Features As… (1), in the dialog window set geometry type to line and - atte …

Use this expression for the Value field of the label dialog, where cars is the name of the attribute field: represent_value( "cars") See documentation: Returns the configured representation value f …

Extract vertices (what you already did) Menu Processing > Toolbox > Delete duplicate geometries Create a new field with field calculator and this expression: array_to_string (overlay_touches ('name …

Your use-case seems to be a classical case to use the powerful atlas-function of QGIS: see Creating Detailed Maps with the Atlas Tool and the documentation. Define a coverage layer - this in your case …

You can use Field calculator with QGIS expressions - see below a step by step explanation how the expression works. This is the expression to use: with_variable ( -- step 3 'array', array_so …

The trick is to copy the folder(s) containing your user profile(s) from one machine to the other. On Win 10, user profiles should be located here: C:\Users\[User]\AppData\Roaming\QGIS\QGIS3\profiles\. …