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Hi , I`m JackPerhaps I can help you with this problem but first could you please give me the tv`s model number ?
Look at the bottom of the tv`s remote and play with the PIP buttons like MODE first , press it a few times , then perhaps SWAP and INPUT , there are 4 buttons that deal with that at the bottom
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unplug the tv`s power cord for a minute and it should disappear , also , try the MODE button , not SIZE
Those are the buttons you pressed by mistake ,I mean that you can tell that it is where that box gets affected so that will be those that will make it disappear or just reboot the tv as I suggested above .