Short Answer 
To open Slack in the app rather than the browser, first install the Slack desktop application, then set it as the default app for Slack links in your system settings. Finally, you can use the ‘Open in Slack App’ option if you’re currently using Slack in the web browser.
Step 1: Install the Slack Desktop App
The first step is to ensure that the Slack desktop application is installed on your computer. If you do not have it yet, visit the official Slack website to download the app. Once downloaded, follow the installation prompts and open the application from your start menu or applications folder.
Step 2: Set Slack as Default Application for Links
After installation, it’s essential to configure your system settings so that Slack opens instead of your browser when clicking on Slack links. This process may vary by operating system, but typically involves:
- Accessing your system’s default apps settings.
- Selecting Slack as the default app for handling Slack links.
- Saving the changes to ensure that Slack will open automatically.
Step 3: Use the ‘Open in Slack App’ Option
If you’re using Slack in your web browser, look for an option labeled ‘Open in the Slack app’. This option is generally available and allows you to switch from the browser to the app with a click. Ensure you’re logged into the same workspace in the Slack app to experience a seamless transition and maintain access to your messages.