How to erase a controller (UUT)? Are there any hidden buttons in the software (ICP for Windows) or is not possible?During programming I am trying to clear the entire memory. Unfortunately, the memory seems to stay after programming the processor and running it

There is no “hidden” button, erase your controller as follows:
Step 1: Run ICP for Windows
Step 2: Keep “Bulk erase device before programming”
Step 3: Don’t load a HEX file. If a HEX is already loaded then clear all buffers by “Edit – Clear All memory buffers”
Step 4: Disable Gap Eliminators – it guaranties that your MCU will be fully reprogrammed with the blank values: – Options – Preferences – Gap Eliminator for PM = OFF- Options – Preferences – Gap Eliminator for DM = OFF
Step 5: Execute “Program (F5)