Hello,
I hope you're doing well, and we apologize for the delayed response and the trouble.
Please ensure you have the latest version of Acrobat installed on the machine: 24.005.2039x Planned update, Jan 23, 2025. Check for any pending updates from the Menu > help > check for updates, install the updates, restart the app and the machine, and check. For more information, see this: https://adobe.ly/3Ec2tUL.
Also, Is this issue occurring with a specific PDF or all PDFs when trying to combine? Please make sure that the OS installed is also updated to it's latest version.
If this is happening with the new Acrobat UI while combining files, would it be possible to share the set of PDF file which you are trying to combine, a screen recording, and the logs from the affected machine for further investigation? Acrobat Diagnostic tool.
About the second question, please check the PDF properties and check the PDF view settings. You can also set it as per your preference, see this article for more details: https://adobe.ly/4htWmcW
Also, the recommendation is to use the Acrobat new UI experience and the tools. To know more about the new UI, please see this article: https://adobe.ly/40H4yzT
I hope this helps.
Thanks,
Anand Sri.
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