Applying categorized symbololgy to many layers using QGIS?

Question

I have many layers that I want to symbol with same rules

Currently, I right click on each layer-->properties-->style--> categorized-->column-->use(my case)-->classify--> -switchboard - star symbol -other - regular circle symbol

now this rules apply to all of the layers that I have. switchboards get a star and other points get a circles.

it's just that I have many layers that I need to apply it to.

Is there a way to do it faster?

For each layer I use an individual color, but I use the same color for the star and the circle e.g if in switchboard 3 I have 24 regular points and 1 switchboard point for the regular I use blue circle and for the switchboard I use blue star I do that by changing the color of each symbol and that's only for switchboard 3. for switchboard 4 I'll use the color red

Answer 1

You can copy and paste styles between layers.

So apply as you do for the first layer.

Then right click on the layer in the layers panel, choose Styles> Copy Style.

Then for the other layers, right click, choose Styles> Paste Style.

Answer 2

You can set one general rule-based symbology that will apply to all your layers. Just build new rules with your desired symbologies (color for each layer, symbol for each feature type) using those references:

"your_field" = value AND @layer_id = 'layer_id'

In the expression string builder, you can find the layer ID values in the Map Layers section while the @layer_id variable is found in the Variables section. "your_field" should be the condition field for point symbology and the 'layer_id' value will control which layer the rule will apply to.

From there, when the rule-based symbology is built, just use the copy/paste style options from the right-click contextual menu in the layers panel.

Here's an example: