How to switch back and forth between the hump method and the underscore method words when editing the code in phpstorm

1. When editing the code in phpstorm, there is a shortcut key: Ctrl+Shift+U, which can be switched to case, but it does not support switching to Hump. as shown in Figure 1

Figure 1

2. In Settings – Plugin – Marketplace, search: Camel, install: CamelCase. as shown in Figure 2

Figure 2

3. A new shortcut key appears in the editing menu: Alt+Shift+U. as shown in Figure 3

Figure 3

4. Select the code: APP_URL, then press and hold: Alt+Shift+U, you can press it continuously until the desired format appears. The final conversion to: AppURL, is what I expected. as shown in Figure 4

Figure 4