IF your picture has multiple layers (it may not - jpeg's don't when brought in)
it will allow you to determine which layer is being modified by the editor,
and to rearrange which layers are on top.
Press control + L to open the Layers window.
In the "Layers, Channels, etc" window, right click on a layer and click delete.
Press Control + L to re-open the Layers window
I actually wondered this for a while when I updated my GIMP before figuring this one out. I tried dragging the entire window and dropping it, but that obviously didn't work. Then I tried grabbing just inside the window and dragging that.Let's take the dialogue box "Layers" for example. The entire window is, in my case, surrounded by a blue border (I use Windows, obviously) telling me that this window is active. Instead of grabbing the blue border, I grab the word "Layers" at the top and drag it into GIMP where it says "You can drop dock-able dialogues here".To add more dialogues to my GIMP toolbox, I drag the dialogue to the raised bar that separates my GIMP toolbox and my other docked dialogues.I hope I've explained this well enough. If something is still hazy, please feel free to ask. Good luck.
Click on windows / dockable dialogs / layers channels paths
Once upon a time you could drop an image into GIMP and start working on it. No more. Now, you must open it through the application. You do this with Ctrl+o for as many images from a single folder as you can handle, or Ctrl+Shift+o to open them all as layers in a single window.
Drag the whole file from a windows explorer window to the GIMP page then use the move tool.
There's a specific command for that under 'layers'. You can also do it in the layers "toolbox" (wrong term- but the stuff on the right side of the screen)
To navigate different layers in GIMP, open the Layers panel by going to Windows > Dockable Dialogs > Layers. You can select, hide, or delete layers by clicking on them in the panel. Use the eye icon to toggle visibility, and drag layers to rearrange their order. To adjust a layer's properties, right-click on the layer for additional options like opacity and blending modes.
In GIMP, to draw on multiple layers simultaneously, you can use the "Paint on All Layers" option. First, select the layer you want to draw on, then go to the "Tool Options" for your brush or pencil tool and check the "Paint on All Layers" box. This allows you to apply your strokes to all visible layers at once. Remember to ensure that the layers you want to affect are visible and not locked.
In GIMP, there is no strict limit on the number of layers you can have in a single project, but the practical limit is determined by your computer's hardware and memory capacity. Each layer consumes system resources, so performance may degrade with a very high number of layers. Generally, most users find that they can comfortably work with dozens to hundreds of layers, depending on the complexity of the images and the capabilities of their system.
Right-click on Gimp in your Applications folder and select "Open With". This will open a window of all your applications and you'll select X11. X11 is under Utilities. I'm not sure how you managed to make Gimp open with Photobooth, but kudos to you haha.