Normally when adding slides, the window should have the same size as the project itself. Which version? Could you clear the cache, restart CP and see if this problem is still the same?
If you are simply recording additional slides you will not see any sizing options at all because the recording size is determined by the Project Resolution.
Is your problem resolved?
I tried to see if I can repro the problem in my Win 7 machine, but I could not.
I used a blank project of dimensions 1024x768 and dual monitors each of resolution 1680x1050. Second monitor was arranged to the left of the main monitor. I launched IE9 which was approx. 800x600. When I chose additional recording, like Lilybiri & Rick pointed out, recording size is set to project dimensions (1024x768). I chose IE9 window as the app to be recorded and selected "Snap to Window". IE9 window expanded to nicely fit the 1024x768 recording window.
Can you please let me know what OS, IE, dimensions you used?
I am having the same issue. Win 7, Captivate 5.5, trying to record scrolling through a PDF file. The red box snaps off skew. I can move it to the center of either window, snap my PDF inside, but the recording cuts off the right side of the PDF.
Can you please let me know what dimensions you used? Are you doing a new recording? If you are doing additional recording, like Rick pointed out, the recording dimensions are fixed.
Thank you for following up this issue.
As Rick and others correctly pointed out, the recording dimensions cannot be changed once they are fixed in a recording. We were trying to record new slides in a project with lower resolution. Then we encountered this issue ☺
As we are newbies to Captivate, we are learning stuff from Forums as well.
Please let me know if this helps.