If you add a local board.txt to your project (vMicro > Add Code > Add Local Board.txt) and then add the below contents to it, it should perform the erase action before upload:

# Add Additional Pre-Upload command to Erase Flash before Upload
sptool_py.cmd} --port {serial.port} erase_flash 

Thanks for the update, and glad it has worked.

Just to be clear there is a boards.txt included in each board package (e.g. esp32), however manipulating this, or adding the boards.local.txt into the board package folder, will be removed whenever you update the package (e.g. v2.0.1 > 2.0.2).  There are alternative routes using the sketchbook\hardware folder, however these become complex to understand and maintain generally.

This is why we have the "Local Board.txt" in Visual Micro, which lives alongside your project so you can override settings per-project, without losing them when updating the board package. It also allows overrides for multiple boards depending on the items being added to the file (e.g. Build Hook Overrides).