Hello,
I have a small problem with gdevelop. I made my layers with my sprites but my objects are like transparent… How to solve this problem? I couldn’t find anything on the subject sincerely
Is the z order of the cabinet higher than the bottom of the wall?
above yes. it is at 1 and the background is at -2
And the background layer isn’t above the layer that the cabinet is on (on the layer window in the scene editor)? Also are there any layer/sprite effects or changes to opacity?
Each object is on a different layer. Being a beginner I did not add any effect to the layers
So you haven’t changed any of the sprite opacities either?
No, I discover as I learn and this is my first brake 
Ramgal, did you check this? Is the furniture layer higher in the layer list than the wall layer?
Also, is your wall drawing just lines with a transparent background?
Yes, I do have the supplies above the background in my layers.
I found ! I had created a gamma with GIMP but instead of just creating my gamma area GIMP made even the base image invisible. I redid the gamma with Krita and everything is good! Thank you so much for your help 
Phew glad you figured that out, I was stumped on what could have gone wrong. 
Yes, I turned that around in my head, I said to myself "but I did everything correctly, I have bad luck!"XD. Now, I just have to find how to make a loop system to do like shantae on gameboy.