Thank you very much for the second advise.  Without using the styles, yesterday 
adding themes  allowed me to compose a single layout with several maps.
Here is a snapshot
[Image]
All the best,
Eléonore


De : QGIS-User <[email protected]> de la part de Alexandre Neto 
via QGIS-User <[email protected]>
Date : mardi, 7 octobre 2025 à 09:41
À : Stefan Giese (WhereGroup) <[email protected]>
Cc : QGIS User <[email protected]>
Objet : Re: [Qgis-user] Composer : several maps at various scale on a single 
layout
This is the trick. Don't lock maps and styles on the composer itself, create 
different themes and ask each map to follow a different theme.

Moreover, if the same layer is supposed to have more than on style, notice that 
you can add several styles to the layer. Right-click > Style > add style.

A theme stores what layers are visible and which style are they using.

Best regards,

Alex

A segunda, 6/10/2025, 12:10, Stefan Giese (WhereGroup) via QGIS-User 
<[email protected]<mailto:[email protected]>> escreveu:

Hi,

the key feature to achieve what you want are map themes (the eye in the layer 
tree widget), where you can define combinations of visible layers. So you can 
define for each composer map the visible layers and use them in the layout via 
"Follow map theme".

see 
https://docs.qgis.org/3.40/en/docs/user_manual/introduction/general_tools.html#map-themes
 for more information

Best regards

Stefan
Am 06.10.2025 um 12:53 schrieb WOLFF Eléonore via QGIS-User:
Hi,
I am using QGIS 3.28 Firenze because my old computer cannot support a more 
recent version.
I would like to print one single layout composed of 19 maps at various scale.  
I have 2 layers in the view which are filtered to display for each map the 
relevant elements.
When I add a new map in the composer after having blocked the first map, the 
content of the first map is changing according to what’s in the view :-/ which 
is exactly what I wanted to avoid.
Could you please tell me how to proceed ?
Thank you very much
Eléonore




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