In case the navigation in Photo and Ortho view is unresponsive and the toolbar disappears we suggest to install the latest graphic card driver from the official web-site (for NVIDIA graphic cards driver version 399.07 or later is recommended). If you are using NVIDIA graphic card and latest driver doesn't help it is suggested to roll-back to 382 driver version.
Alternatively, we can suggest to run Agisoft Metashape (Agisoft PhotoScan) in ANGLE compatibility mode from the command-line:
metashape.exe --opengl angle
Also, you can create a new shortcut to Metashape executable and modify the Target field after path to metashape.exe according to the attached screenshot. Running Metashape via this shortcut would solve the visualization issue likely related to the compatibility of the installed graphic card driver and the latest Windows update.