[QGIS-Developer] Locked layers and styles in layouts - where to see used layers?

[magerlin]

I am going to reuse an old project file with 20 layouts which each are
different based on what layers are locked in the layout.

But now the background map source is going to be changed so I have to unlock
layers in all 20 layouts to make them show the new background map. 

But then I will loose the information on what layers should be locked (ie.
included) in each layout.

Anywhere I can see what layers are included/locked in each layout?

Final solution may be to open the project file in an XML editor - it must be
stored there somewhere

I should probably have used "map themes" but it is to late now......



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Regards Morten

Currently using Qgis 2.18.23 (OSGeo4) and Qgis 3.4.2 in parallel
Windows 7, 64bit
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