I see this app is a customized ArcGIS Pro, so please put the Light UI mode back. If you deal with imagery it is usually beneficial to have Dark mode, but in case of presentation & education the dark is nightmare on low contrast projector. Sometimes the office is full with light, even with correct screen positions, in this case it is strenuous to use a dark app. Dark apps are great in dark environments. A lighter/customizable basemap, and/or with lighter symbology would be also great! Check out the following print screen. Do you see the camera symbols, symbolized by Camera Position Residuals X? They are there, but simply too dark to draw some attention.
![kosHalmai_0-1690917021835.png kosHalmai_0-1690917021835.png](https://community.esri.com/t5/image/serverpage/image-id/77008i8B643E2C23CA869A/image-size/medium?v=v2&px=400)
Thank you & Best regards,
Ákos Halmai