When switching modes, the complete geometry is redrawn and the model appears properly on screen. So, if you zoom in when in Structures mode, switch to Soil mode and back to Structures mode to get the updated zoom level.
When dealing with a lot of tunnel models with these relatively small arc segments that cause the described issue, users are advised to use PLAXIS 2D 2017.00, and not 2D 2017.01 in order to have a fluent workflow.
We are working on a solution to this problem.
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