At times the labels for project items may be blocking important information or visuals. To resolve this issue, you may opt to re-position the label of a project item by hovering your mouse over the label. Once the label turns a light-blue color (after 1-2 seconds of hovering) then you may re-position the label by using click+drag on the label and dragging it to the new desired location. The figures below show this process for a label of a detector that is slightly hindering the view of the direction vector.
The direction and orientation of the new label will be saved. The label will retain its text size and always be facing you in the 3D window. You may change the text size and label coloring from the settings panel shown in the images below. You may also opt to have a transparent background. The default options are a white background with black text, if it is changed it will be saved to the project file you are working on.