Fill Toggle
If the lines or objects in your drawing look hollow, the Fill toggle might have been turned off. To turn the Fill back on, click the Fill toggle button which is located beside Ends and Org Toggles.
Entity Attributes
You can revise objects that are currently not filled by opening the Edit Entity Attributes panel, seen below, which is opened by holding [Ctrl] + left-clicking on the entity to be revised then place a check in Filled, then click OK.
Revise Entity Attributes
You revise multiple objects by opening the Revise Entity Attributes, seen below, which can be found in the Advanced Tools, then place a check Filled and left-click on all the entities you’d like to fill, then right-click to apply the change.