Option 1: The SCHLIB List panel is probably a good place to start. See the official documentation here:
https://www.altium.com/documentation/altium-designer/sch-pnl-schliblistschlib-list-ad
Open a SchLib file, then open the SCHLIB List panel and select Edit
all objects
from all components
include only Parts
at the top of the SCHLIB panel:
That should get you started, and allow you to edit the descriptions like a spreadsheet.
Option 2: The Parameter Manager tool is another way to do this. Again the official documentation is here:
https://www.altium.com/documentation/altium-designer/workspacemanager-dlg-parametereditorformparameter-table-editor-ad
With a Schlib open navigate the menus to Tools -> Parameter Manager...
. In the Parameter Editor Options Panel, check only Parts
in Include Parameters Owned by
section. Make sure Exclude System Parameters
is not checked (i.e. you want to include system parameters) in the Other Options
section:
Press OK
and you should be able to modify the 'Description' under the System Parameters
sub-column. Then be sure to Apply Changes
and complete the ECO process...