To change the presentation resolution in Microsoft PowerPoint, you can follow these steps:

1. Open your PowerPoint presentation.
2. Click on the “Slide Show” tab in the ribbon at the top of the window.
3. In the “Monitors” section, you will find the “Resolution” dropdown menu. Click on it.
4. Select the desired resolution from the available options. You can choose from various standard resolutions or enter a custom resolution if needed.
5. Once you have selected the resolution, click on the “OK” button.

Note that changing the presentation resolution may affect the layout and formatting of your slides, especially if the new resolution is significantly different from the original one. It’s a good idea to review your slides after changing the resolution to ensure they still look as intended.