Disabling the Get Latest Prompt for Source Control—Perforce
By default, when you open a project that is bound to source control, a message automatically asks if you want to get the latest version of files. However, you can disable this prompt in the Options dialog. Therefore, in the future when you open the project you will no longer see the message, and the project will open without replacing any local files with the latest ones from source control.

- Select File > Options. The Options dialog opens.
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Select the Source Control tab.
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Click the check box Do not prompt to get latest when opening source control bound projects.
- Click OK.