Click gear button at the top-right of each pane. There are other means, right-click menu or pressing Ctrl+Y.
Click humberger menu button at the top-right of PFT pane.
Press F11 key (in other than typable area) or use right-click menu.
Same as switching to full-screen. F11 or right-click menu.
In 'General' config, click 'Log Window (See log until now)' button.
Semi-transparent window option was omitted.
In 'Main Display' config, click 'Advanced' to expand and check 'Start a new line every time'.
Just a memo, no transmitting to other members. Usage example : keep memo of the order in your team.
To receive from others, open ports 6633:6644/UDP and 6711:7835/UDP and open ports 8080/UDP (default) for simple web server
Sample using firewall setting tool (GUFW)

Tauri for application toolkit.
From mekiku2 version 0.31, license files are included in the "licenses" folder.
In the Windows version, mekiku2-installed folder (%localappdata%\mekiku2) contains "licenses" folder.
In the Linux version, zip file contains "licenses" folder.