StefanL38:
As soon as I create a subfolder named "portable"
this is a switch for "D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\Arduino.exe"
to take any and all configurations found in D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable?
Correct.
StefanL38:
and the only thing I have to do is copying
C:\Users\Stefan\AppData\Local*Arduino15*
D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable
so that there is a folder
D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable\Arduino15
Incorrect. You must copy the contents of C:\Users\Stefan\AppData\Local\Arduino15 to D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable, not the C:\Users\Stefan\AppData\Local\Arduino15 folder itself.
StefanL38:
and copy my sketchbook-folder
which I have in C:\Users\Stefan\Documents\Arduino
to D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable\sketchbook
so all my sketches are inside this folder ?
Yes. As with C:\Users\Stefan\AppData\Local\Arduino15, copy the contents of C:\Users\Stefan\Documents\Arduino to D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable\sketchbook, not the C:\Users\Stefan\Documents\Arduino folder itself.
StefanL38:
No it is not enough. What I have additionally done so far is
copying the folder D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\lib\theme
to have my modified theme in the portable version
You can do that if you like. I prefer to install themes in the sketchbook though.
StefanL38:
I reduced the boards list with the Arduino Board Switch-plugin
the boards list dose contain all Arduino-boards. This means there has to be copied the file that contains this modified list
The file that contains the modified list is in C:\Users\Stefan\AppData\Local\Arduino15, so it will be copied along with the contents of that folder. No additional steps are needed for this.
StefanL38:
If I lookup the available boards the ESP8266 boards, ... and the Seeduino XIOA-board are not listed.
So again something additional has to be done.
This is because you didn't copy the contents of C:\Users\Stefan\AppData\Local\Arduino15 over correctly. Once you get the D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13\portable folder structure right, they will be listed.
StefanL38:
the teensy boards
Teensy is different because this is actually a modified version of the Arduino IDE, rather than a standard boards platform like everyone else uses. Just run the Teensyduino installer on D:\ArduPTest\arduino-1.8.13-windows\arduino-1.8.13.
StefanL38:
post the folders that you used and the steps you have done
I already did that. See reply #3.