Click Home tab - Layers panel - Layer Properties.
Select the layers you want to turn on or off.
Click the Layer icon in the On column to set the status of the selected layers.
on & off
clip the viewports
you can use quick select option..it is also very useful.
check if the objects are made invisible for the view port by doing the following.
1. double klik on the view port to enter the model space.
2. check in the layer manager under the view port column if the objects layer is turned on or off.
let me know if it helped.
Thanks so much!:)