Situation: Working in sandbox mode, I started working on a rough but complex model of the International Space Station (ISS) - it's actually looking pretty good! The core truss segment is completed. To begin populating the station I docked an Apollo-style command capsule with 3 Kerbals aboard to a RockoMax HubMax Multi-point Connector located dead-center in the station's structure. The connector is fitted with Clamp-O-Tron Docking Ports. The capsule, an MK 1-3 Command Pod, is fitted with a Clamp-O-Tron Shielded Docking Port. The docking process was completed easily.
Crew & Equipment Status: It's now time for pilot Jebadiah Kerban to return home and retrieve more station parts and occupants. All systems aboard the Command Pod (Monoprop, Electrical, Fuels, etc) are full and ready to go. Likewise the station's resources are at peak levels.
I RIGHT-clicked on the Command Pod Shielded docking port, which is open. I noticed that the "Undock" and/or "Decouple Node" options are missing from the dialog box. All other options remain set to their default values. Nothing happened. Next, I RIGHT-clicked on the already-mated-to multipoint connector's docking port. The option to "Decouple Node" (or was it "Undock"?) IS there. I LEFT-clicked on it and...IT MAGICALLY DISAPPEARED FROM THE LIST OF OPTIONS!!
Such is my sad story. Nothing I would try after that would work. I toggled all options in the dialog boxes one at a time and even reduced the "Docking Acquire Force" to zero (0) on both ports. Please help. Jebediah, Bob and Maddan are quickly running out of food! Bob is complaining about some infection and has a fever!
Potential solution research Conducted: I've spent hours looking over posts that are 1-4 years old. Most of the suggested "fixes" were for versions a lot earlier than mine. Some seemed to be way above my pay grade and a couple sounded down-right dangerous!!
Epilogue: It's a fun and educational game/simulator. I'm far from finishing blowing things up and sacrificing innocent Kerbals in the never-ending pursuit of infinite knowledge. Hopefully there's someone out there who can help me solve this problem so I can continue my mad-dog ways.
Thanks in advance.
Here's the technical stuff if it helps...
The game
Purchased from Steam early 2020 Stock version
Present version: 1.11.2.3077
Added "Making History" (ver. 1.11.1) in fall of 2020
Added "Breaking Ground" (ver. 1.6.1) in fall of 2020
The Computer
Microsoft Windows 10, all updates are current
System: 64-Bit
Motherboard: ASRock. X570 Phantom Gaming 4, Water-cooled
Processor: AMD Ryzen 7 3800X 8-Core Processor, 3893 Mhz, 16 Logical Processor(s)
Physical Memory (RAM) 32.0 GB, Available: 23.7 GB (KSP is running)
Total Virtual Memory 59.2 GB, Available: 44.7 GB
Graphics: NVIDIA GeForce RTX 2080 SUPER;
Storage: HDD: 946.37 GB; SSD1: Patriot P200 1TB; SSD2: ST4000DM004, 3.64 TB
Monitor: HP 28yh; Resolution: Resolution 1920 x 1080 x 60 hertz Native
Audio: NVIDIA & RealTek High Definition Audio
Other: External DVD/CD-ROM Read/Write; WiFi, LAN, Bluetooth