You may follow the steps below and see if it can resolve the issue:
1. Open the properties of the shortcut to the MS-DOS-based program.
2. On the General tab, click to clear the Read-only check box if it is selected.
3. Click the Screen tab, click Window, and then click OK.
If that does no difference you can follow the path below and try the step as well.
From tools menu --> Disable integration features and try again. This should allow DOS application to run in full screen mode.
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