Remove unwanted "thing"

Hi,
I have noticed I sometime have created something that looks like a cube, but i do not know what it is or what it do. My question is what is it what it does and most important how can I remove it.?




Thanks your your help and I’m looking forward to hear from you.

Yours sincerely
Greenality

Check Display Texture Space is unticked

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Ah :slight_smile: thank you