I used the module v2.2.3 for my site, however, I an see that your module removes the Mini Cart and Search tool on the checkout page.
This design doesn't suite for us.
Can you tell me how to show the Mini Cart and Search tool on the one-step checkout page?
To have the Mini Cart and Search tool on the checkout page, please apply the file attached below to your theme the path:
For example, your site's path is: /xxxx/xxxx/apps/magento/xxxx/app/design/frontend/bsscommerce/themexxxxx/Bss_OneStepCheckout/layout/onestepcheckout_index_index.xml)