Theoretically speaking, UBI operates within the structure of capitalism, so it’s right wing by definition.
Practically speaking though you have supporters across the spectrum. On the left as a poverty elevation strategy, and on the libertarian right as an equaliser to enable entrepreneurs to take bigger risks.
On the right the split seems to be between those who are rich, and don’t want to pay tax to fund UBI, and those who aspire to be rich but don’t have the funds or safety net to start a business and see UBI as a way to provide it (without seeing themselves as someone who receives state aid / benefits).