I have enabled the one page checkout in Magento 2 but still my checkouts are multipage. What should I do to more than setting enabled under stores-sales-checkout options in the Enable Onepage Checkout box?
Magento default settings
Admin >> Store >> Configuration >> Sales >> Checkout >> Checkout Options >> Enable Onepage Checkout >> Yes.
This options by default enabled, it is showing 2 steps checkout with one page not one step.
If you need to one step checkout, you need to install 3rd party extension for one step checkout.
Note : One step and one page both are different, Magento give only one page checkout not one step.