Will the screen size be of a phone? i want it to be the size of my laptop screen?

✅ YES, you can set the virtual device to fullscreen, and you can also choose a custom Primary Display resolution larger than a phone-sized screen. Genymotion Desktop is not limited to phone-sized windows.

In Display, Primary Display lets you select a predefined resolution or set a custom one, and Window style includes Full screen. The default skins include phone and tablet frames, and you can also create a custom skin if you want a different look, but the actual device display size is controlled by the resolution settings. Sources: Virtual Devices Settings, Basic Controls, How to create your own skin in Genymotion Desktop?

What laptop model and screen resolution are you trying to match?