To enable the 'Attach to Process' toolbar button in Visual Studio 2013, 2015, 2017, and 2019
- Right-click on any toolbar and click 'customize...'
- Click the 'commands' tab
- Click the 'Toolbar' radio button
- Select the toolbar where you want your button to appear from the dropdown
- Click the 'Add Command...' button
- Select 'Debug' from the categories list on the left
- Select 'Attach to Process' from the commands list on the right, and click ok. The button will appear on your selected toolbar.
- Optionally, use the 'Move Up' and 'Move Down' buttons on the right to move your new button to your desired location within the toolbar. I keep mine just after the Debug button.