Switch to Explorer mode by selecting the icon in the left vertical toolbar. In the left pane of the window, select the Task Runner section:
Under Task Runner, select tasks install, then build:
The progress of the task will be displayed in the terminal:
If you do not see the Task Runner section in the left pane of the window, you should probably install the Task Runner extension. Alternatively, you can execute the npm install & & npm run build (yarn & & yarn run build) commands from the terminal or execute the build task using the Ctrl-Shift-B keyboard shortcut.