POS (Point of Sale) Web App

I have a project for a client to designing POS. Currently they are using Laravel template and the experiences are not easy to use and it is not easy to understand for users. Not sure yet is there any theme colors later or not, but I've chosen the blue calm colors as default so it will be suitable for all users taste.

I'm trying to make it as simple as possible. I think for dashboard we need to make it simple rather than using complex UI especially if there will be transaction interaction because it is crucial.