Welcome to our forums, @Zube,
I appreciate the time you've given joining this conversation. It's my pleasure to help and guide you set up the multi-user feature for your QuickBooks Pro licenses.
Before we start, please make sure your PC meets the system requirements for QuickBooks 2019 to avoid compatibility issues when installing the program and enabling the multi-user network. Once done, follow the steps to install QuickBooks on your workstation:
Once installed, follow the steps found in this article to start the network: Set up multi-user network
To switch between modes:
I'm also including some resources that walk a user through the install process:
I'm confident you'll have the software installed in no time. If I can be of further assistance, please let me know by clicking the Reply button below. Have a great day!