This issue doesn't appear to be a Videopad fault. Try closing VP first in minimum, then in max window modes. Here's an AI summary...
"VideoPad does not have a built-in option to control the window size or layout when opening a saved project. According to user reports and official forums, VideoPad will reopen in the same state (window size and layout) it was in when you last closed it. If you closed your project with the window minimized or in a non-default layout, it will reopen in that minimized or altered state the next time you load the project..
How to Ensure Projects Open in Default Layout
There is currently no explicit setting in VideoPad to force projects to always open in the default (maximized or standard) layout. The program simply remembers the last state and restores it on launch.
Workarounds
Before closing VideoPad or your project, maximize the window and arrange the layout as you prefer. The next time you open the project, VideoPad should restore this state.
If you have undocked or moved panels, use the "Dock" button to return them to their default positions before closing.
If the interface appears minimized or panels are missing, manually maximize the window and use the View menu to reset or show/hide panels as needed."