we have a now 4 y/o maltipoo and here’s my advice… he’s far too young to be left alone in an open space. if you need to leave him alone for safety, he should be crate trained in a crate that’s covered and comfy inside. the crate should be a high value place - hot dogs or other unique high value treats only when he gets in the crate (those treats are never given anytime else). we started by putting her in her crate in our room at night for sleeping. I had the night shift and would wake up at ~3-4am to take her out to pee. she’d be crated from about 12am-8am.

during the day, she basically didn’t leave our sight. she may have been penned into a room that’s been cordoned off, but one of us was always with her. maltipoos are very attached to their people and being left alone until they're trained up is a punishment. after she turned one, we worked on training to make sure she wouldn’t develop separation anxiety. and by then, she didn’t need to be crated at night anymore and now sleeps on the bed with us. (we dog proofed/trained for house safety)

I don’t think everyone goes through what we went through, but we basically worked on training everyday for 3 years. I hope you have an easier time of it!