We appreciate the information that you've provided, Sarah. Just to ask, does it only happen on the device that you're using? The advised to check the browser size is a way for us to make sure that this is not a browser issue or for us to further isolate the issue that you are experiencing.
In the meantime, we recommend to run the System File Checker or SFC as an initial troubleshooting procedure. This is a utility tool built into your operating system to check any corrupted or missing system files. We also suggest that you also scan your files using any antivirus program if there's any virus that is affecting the performance of your device.
Let us know how it goes and feel free to get back to us if you need further assistance.