Long press power → the primary drive and gear icons are displayed → I press and keep pressing the shift key and at the same time I click the Macintosh HD icon → only the “continue” label is displayed, not the "Continue in Safe Mode label→ I clicked on Continue → I booted in normal mode.
The solution
With the above procedure which I must have tried 50 times, I never saw the “Continue in Safe Mode label.” I now understand that I must wait for the Macintosh HD icon to display → click on the Macintosh HD icon without pressing the shift key → and ONLY AFTER that press the shift key → the "Continue in Safe Mode label appears → I click on it → I am in safe mode.