Sometimes the answer is not in the transcript and you have to open the machine.
The desktop client is a native Windows application that manages many RDP sessions at once, over the real Microsoft RDP engine.
Many desktops, one window
Colour-coded tabs. Background sessions stay connected while you work in another, and tabs reorder by dragging without dropping the session underneath. The remote desktop fills the tab with no scroll bars, and resizing changes the remote resolution live — or reconnects at native resolution, whichever you prefer.
Credentials once, per folder
Organise machines into folders and set the domain, username and password on the folder. Everything beneath inherits it, resolved at connect time, with per-field override where one machine differs. Passwords are encrypted to your Windows account, so a copied database is useless anywhere else.
Open a whole folder
Right-click a folder to open every machine in it — connected one at a time rather than all at once, so the RDP stack is not hammered. Open sessions are offered back on the next launch, and a session that drops retries on a widening backoff.
Across monitors
Several windows over one shared set of machines. A machine lives in exactly one of them: open it elsewhere and it moves rather than dialling twice. Window positions are remembered and re-fitted to whatever monitors exist next time.
Platform
Windows. A macOS port is in development and is not yet a shipping product.