For changing the seperators you will need to do the following:

Activate the developer mode from Setings.
Go to Settings > Translations > Languages
Go to Form view of your current language

In the `Separator Format` field, set [5,0]
- Here the format is to specify seperator placment counting from decimal seperator:
eg: if the value is 550000.00 it will display 5,50000.00
- For more control over seperator placement keep adding place ie: [5,3,0]
eg: if the value is 5127000040.00 it will display 51,270,00040.00

Odoo will add sperator placement from right to left so 5,3,0 -> from decimal places leave 5 digits -> add seperator -> leave 3 digits -> add seperator, then keep repearing every 3 digits.

The last value 0 is to repeat the last sequence so keep repearing every 3 digits id [2,3,0].
- ie: if the value is 123456879.00 > 1,234,568,79.00
change 0 to -1 to avoid repeating [2,3,-1]
- ie: if the value is 123456879.00 > 1234,568,79.00