By default, the left button is the primary button of your mouse in Windows 10.
If you wish, you can change primary button of your mouse at any time you want and here is how:
If you want to go back to default, then unselect "Switch primary and secondary buttons" option (remember that the changes are immediate) and then hit "OK."
If you wish, you can do the above task with the following steps:
That is all. The right button is the primary button now.
If you want to revert to default, open the above discussed drop-down list and select "Left."
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How to Change Primary Button of Your Mouse in Windows 10