In Adobe Photoshop, there are a few different ways to do it if you want to reset basic functions or revert to default settings. This can help with some issues with the app or when you want to clear the customizations and go back to the initial state. Here are a few ways to reset the basic features of Photoshop:
Photoshop allows you to reset individual tools to their default settings. With a tool selected, right-click the tool icon in the tool's options bar (in the upper-left corner) and select Reset Tools or Reset All Tools.
Resetting preferences when you launch Photoshop is a more thorough way to fix more issues. Close Photoshop and then press and hold it immediately when you restart Photoshopalt + control + shift(windows) oroption + command + shift（macos）。When asked if you want to delete the Photoshop preferences file, select Yes. This will restore Photoshop to the default settings.
In some Photoshop versions, it is possible to reset preferences directly through menu options without the need to use shortcuts at startup. Go to the "Edit" (Windows) or "Photoshop" (macOS) menu, select "Preferences" >General", and then tap "Reset Preferences".
Before you do this, it's a good idea to back up your work and important settings. This is especially true when deleting the preferences file, as this removes all customizations, including workspace layouts, font preferences, and more.
Resetting preferences or tools will not affect your project files, but it will affect how you use Photoshop, as all customizations will be cleared.
Different versions of Photoshop may have subtle differences in menu layouts and options, so if you can't find the above options, it's a good idea to check out Adobe's official help documentation or support community for guidance that matches your specific version.