How do I delete the icons on the desktop (activities apps)?
Welcome to Fedora @mrodia
Can you please add some more tags that we can see about what Destop Environment and Fedora Version you are talking?
I am using Fedora 38 Workstation. Gnome 44.5.
If you mean the icons when you click on the 
button, this are *.desktop files.
The mayority of them resides in /usr/share/applications. If you can not find it, search with locate for example: locate audacity.desktop
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additional, user-owned program starters are in ~/.local/share/applications
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If the app the icon applies to is installed then removing the icon is usually as simple as uninstalling the app.
If it is a .desktop file that you as the user created in ~/.local/share/applications/ then you can also remove that icon by removing the user created .desktop file.
If the icon shows on the dash at the bottom of the screen when you press the super key then removal from the dash is as simple as a right mouse click while the mouse is on the noted icon and select ‘unpin’. That leaves the app installed but removes the icon from the dash.
In the *.desktop files, delete the value of the variable Icon. The reason for removing icons is not stated so I’m assuming a desire to unclutter Activities. As an example, left click on Text Editor and move on top of gedit which creates a container for both. Do the same for any other editor. Then name the container something like Editors by clicking the container and select the icon (pen and paper). To move the container, left click it and move container to the edge of left/right screen or a convenient position.