Let me tell you what i mean

For Example: whenever i open minecraft aand the title screen comes its just the background with the singleplayer multiplayer thing at the top middle part then suppose i open hypixel i open the server the curser,hotbar just shrinks i tried re-installing the game its not working 

I request mojang to please tell me how to fix this its impossible to play ill leave a few screenshots 

IGN:MythPlayz