Enable Traffic Flow on the Mikrotik router:
ip traffic-flow set enabled=yes cache-entries=4k set active-flow-timeout=30m inactive-flow-timeout=15s interfaces=all
ip traffic-flow print
Specify the IP address and port of the computer that will receive the Traffic-Flow packets:
ip traffic-flow target add address=192.168.88.240:1234 disabled=no version=9 v9-template-refresh=20 v9-template-timeout=30m
ip traffic-flow target add address=192.168.88.240:1234 disabled=no version=5
ip traffic-flow target print
To configure through the GUI, the settings can be found in the menu IP -> Traffic Flow.
For monitoring under Windows, you can install the program ManageEngine NetFlow Analyzer, which will work as a server, receive packets from the specified port and generate graphs and statistics via a web server that can be opened by the browser.
For monitoring under Linux, you can install and configure for example flow-tools.