Unused Copper Layers in Pcbnew

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Can somebody help me with this please. I have designed a board with 6-layers as I thought that was what I would need. In fact I completed it with 4 layers. So, what I am trying to do is to simply remove the unused copper layers but KiCad appears not to be giving me the option of which layer I should remove. It seems it wants to just remove any two layers and I am concerned that it will remove the wrong layers.

I thought I could just untick the layer that I don’t want but I get the following message instead:

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If try what Kicad suggest, I get the following message:

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Frightening as I don’t know which copper layer it will remove.

Is there a safe way that this can be done?

Many thanks.

Sorry I should have mentioned that I’m using Kicad 5.1.7. Before I get told off, it’s not my choice. My paying customer insists I use that version and would not be persuaded any other way!

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I don’t know . . . but logically it would remove In3 & In4 so if you ensure that your inner layers in use are In1 and In2 you should be OK.

Do a full backup, or two just to be safe and give it a go.

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Actually, I have used In3 and In4. Free layers are In1 and In2.

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Many thanks @RaptorUK . Sorted. As expected, it deleted my used In3 and In4. However, fortunately these are just power planes of the same shape as my ground plane on Btm_Cu. So I just copied the polygon to In1 and In2 and rename the nets. Voila! All is well.

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You are welcome :slight_smile:

For future reference, you could have edited the properties for your Zones (planes) and moved them to the correct layers.

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Also, PCB Editor → Edit → Swap Layers.

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Not sure that was available in V5.1.7

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Oh, I forgot… … … … 20char

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In the last couple of days I got an LTSpice simulation file from a colleague; it would not run. I had to downgrade…install an older LTSpice version from about 7 years ago. Then it ran without difficulty.