Hello, I have recently downloaded Inkscape on my Mac. I am currently creating a logo with certain shapes and a coloured background. When I create a new shape and have its colour filled in, the colour is opaque and merging with the background colour. The layers are 100% opacity, the objects are 100% opacity, and the blend mode is normal. What could be the reason for this please?

Here is a screenshot:

https://app.gemoo.com/share/image-annotation/643339491429666816?codeId=vJ3pzYxeXgj3o&origin=imageurlgenerator&card=643339489974243328

Please share an example Inkscape SVG file.

You can attach to a reply using the paperclip button at the bottom of the reply area.

Hre's an old post that might help you.
https://inkscape.org/forums/tutorials/how-to-select-multiple-objects-having-the-same-colors-at-once-instead-of-selecting-one-by-one-in-inkscape/#c59191

here is the svg file. it seems to have attached as an image when i look at my reply after? please let me know if it is the same for you

Maybe this:

i did not know that is opacity! Wow, thanks very much