Use Layers

Create Objects on Layer

Home tab > Layer pamel > Layer List

Select Object layer

Draw a rectabgle 1000 x 500
Rectangle's properties using the properties of the current layer

Continue creating different objects on different layer

Freezing the Layer

Layer List - Click on the Sun icon beside the Hidden layer

Objects on the Hidden layer are disappear
Current layer cannot be frozen

Shift Objects from one Layer to another

Select the objects to be shift

Layer List - Select the destination layer

Layer Transparency

Layer panel > Layer Properties
Click on the transparency on the layer

Select 70

Objects on the Hidden layer become dim