This is the image of the glitch, i was loading up a build and then a square appeared, im having it there for 3 rough days straight, mods i use:
Litematica 1.19.3
Malilib 1.19.3
Can anyone help me out? I dont want it to be there its just so annoying.

It's not a glitch, it's the area selection box.

To remove/hide an area selection box in Litematica, you have 3 options:

• Easiest(?)/most common: Switch to the Normal selection mode (in the Litematica main menu, middle left) and unselect any selection save file you may have open in the Area Selection Browser
• Turn off the area selection box rendering (in Visuals -> enableAreaSelectionBoxesRendering or using a hotkey toggleAreaSelectionBoxesRendering)
• (If you are in Simple mode and don't feel like switching to the Normal mode) Just collapse it somewhere out of the way using the "tool item" (in the Expand tool behavior mode by just right clicking where you want to move it, or in the Corners mode both left and right click in the same position to move both corners there.)