How can I change the shape of the thousand separator?
It could help if you described in detail what you want to achieve. I don’t even understand the question in the summary “from above the numbers to below to them”.
In the Format>Cells... menu choose a number format with thousands separators. You can change the thousands separator manually with “Format code”.
This only works for numbers less than 1 Million, since it doesn’t change the thousands separator. You need to change the Language of the cell to a value fitting your requirements and tick option [x] Thousands separator
Furthermore for numbers less than 1000 it displays a leading ' character as any character not being a number format code character in that context is just literally displayed at that position.