Minecraft display problem

My Minecraft launcher works fine but when I clicked on play, it started loading but all I saw was a black screen. I pressed my Windows button to exit the window only to realise that the game itself was loaded and I could only see it as a small window when I hovered my cursor over the icon of the window. When I clicked on it to bring it to full screen it would only just show a black screen.
this happened recently. when i tried opening minecraft, midway into it i closed my discord window, and then when i did the thing in bold, i managed to exit the minecraft window but it showed me the closed discord window. i could not interact with the discord window though.