Hi ice , yes finding and keeping an object on the laptop can be tricky considering the FOV of the ToUcam is about that of a 4.5mm eyepiece.
What I do , as I have the gain right down so images are dimmer on the screen but less noise , is to use an el cheapo Chinese 70mm refractor as a guide scope. It only cost $100 but give an excellent image
considering .
I use a 25mm eyepiece and the G.S. has a FR of 900mm. This give a reasonable magnification but allows for a reasonable field of view.
I than focus the main scope and ToUcam on a bright star and tighten the focuser screw so it won't move.
You then just follow the object or guide star with the G.S. to keep it on the laptop .
I know you have a Dob but most nights I don't worry about polar aligning my mount and with a 4x Powermate and a 1900mm FR it does not take much for the image to drift off the screen and it can be hard to find again .
That's what I do , some people swap the ToUcam over with a wide field eyepiece and than back , but you have to refocus each time and you can't track it that way.
Mark