How to use a laptop with a HDMI to usb capture card as a screen for a thin client?

Many of the remote desktop options how to control a Pi over a direct ethernet cable we discussed here are not very straightforward: https://petergamma.org/category/singe-board-computer-displays/ Our is to use an Android phone as a Pi screen as shown in this video: So we tried something else But later on we sah only colorful stripes in OBC …