When using only the laptop, you will need to rearrange those Fences manually.
What you can try is while still with all 3 monitors connected (2 external + one laptop). Save your current layout (3 monitors). Move all the fences to your laptop screen. only Save another layout. Detach the two external monitors. Fences still on the laptop only, yes? If not, load the saved layout for laptop monitor only. Once all the fences appear on the laptop, arrange it properly if needed, save another one and this is for the laptop only.
Thank you,
Basj,
Stardock Community Assistant