How do I change the source monitor's aspect ratio to be vertical 9:16?

[ColdPizza]

I am using Premiere Pro on Windows 10. I am editing a vertical video and I changed the program monitor to 9:16 aspect ratio however when I open any clips in the source monitor panel, the monitor is set horizontal 16:9. I applied a 'transform' master clip effect to the files to get them in the right orientation but that doesn't make the source monitor flip.

How do I do this? Thank you.

[Sami Succar]

Here is one way to go about it.

[Ann Bens]

Here is one way to go about it.

By @Sami Succar

Your gif is too big (stretched over two monitors) there for unreadable.

[Carl27629118pgx9]

On mac, go to the source footage in finder. Select galery as your viewing option. Select all footage you will use in your edit, then hit the rotate button at the right corner of the menu. Once all footage is rotated to vertical, load them into premiere. Now the source monitor will recognize the vertical format as the original orientation and eventually the aspect ratio.

[richi_senk]

It works, thank you!

[jrodjared]

This is the way.

[jordimorales]

This is what I was looking for. Big thanks!