Confirm that "auto_complete": true has been enabled in user settings; 2. Check whether the syntax recognition in the lower right corner is correct, such as Python or JavaScript; 3. Troubleshoot plug-in conflicts, especially for complete plug-ins such as LSP and Anaconda, and try to disable or use safe mode startup; 4. Adjust the autocomplete delay and trigger range to ensure that the "auto_complete_delay" and "auto_complete_selector" are set reasonably; 5. Wait for the index to be established or delete the Cache folder to clear the cache; 6. Check whether the key bindings cover the completion function and restore the default settings if necessary; check the above steps one by one to solve the problem of Sublime Text automatic completion not working.

Sublime Text automatic completion does not work is a common problem that many users have encountered, especially after just configuring the environment or installing the plug-in. This problem may be caused by a variety of reasons. The following lists common causes and corresponding solutions.

1. Check whether the automatic completion function is enabled

Sublime Text is enabled by default, but sometimes the settings may be modified.
Please check the following settings:

• Open Preferences > Settings
• In the right panel (user settings) confirm whether the following configurations are available:

 "auto_complete": true,
"auto_complete_triggers": [{"selector": "source - comment", "characters": ".<"}]

If "auto_complete" is set to false , change to true .

?? Note: Do not modify the default settings on the left directly, only add or modify them in the user settings on the right.

2. Make sure the file type is correctly recognized

Automatic completion relies on syntax recognition (such as Python, JavaScript, etc.). If Sublime does not correctly identify the current file type, the completion feature may not trigger.

Solution:

• View the syntax displayed in the lower right corner (such as "Plain Text" or "Python")
• If it is "Plain Text", click it and select the correct language (such as "Python", "JavaScript", etc.)

You can also use the menu:
View > Syntax > Select the corresponding language

3. Plug-in conflict or Package Control issues

If you install third-party completion plugins (such as Anaconda , LSP , SublimeCodeIntel ), they may conflict with default completion or be configured incorrectly.

Troubleshooting suggestions:

• Temporarily disable all plugin tests:
  Go to Preferences > Package Control > Disable Package , disable the plug-in one by one, and see if it is restored.
• Or start Sublime in Safe Mode:
  When starting, hold down Ctrl (Windows/Linux) or Cmd (Mac) to see if the completion is normal. If it is normal, it means it is a plug-in problem.

Common situations: After the LSP plug-in is enabled, the completion function will be taken over, but if the server does not start correctly, the completion will "look out of work".

4. Completion trigger characters or delay settings are inappropriate

Sometimes the completion does not pop up because there are too few trigger characters or too long delays.

Add or modify it in user settings:

 "auto_complete_delay": 50,
"auto_complete_size_limit": 4194304,
"auto_complete_selector": "source, text",
"auto_match_enabled": true

• auto_complete_delay : Delay milliseconds, 50 means 0.05 seconds, faster response
• auto_complete_selector : Controls under which syntax to enable completion

5. Cache issues or index not established

Sublime's completion relies on symbolic indexing of a project or file. Newly opened projects may take a little time to index.

Solution:

• Wait for a moment to see if it will automatically recover
• Restart Sublime Text
• Delete the cache directory (cautionary):
  • The path is generally: ~/Library/Application Support/Sublime Text/Cache (Mac)
  • Or C:\Users\YourName\AppData\Roaming\Sublime Text\Cache (Windows)
  • Close Sublime, delete the Cache folder, and reopen

6. Check whether the key binding is overwritten

Some plugins or custom keys may interfere with the completion popup.

• Open Preferences > Key Bindings
• Check whether there is any blocking of auto_complete commands
• You can try to restore the default keys

Summary of processing steps (quick inspection)

1. ? Confirm auto_complete to true
2. ? Check whether the file syntax is correctly recognized
3. ? Restart Sublime Text
4. ? Try running in safe mode (Ctrl/Cmd to start)
5. ? Check for plugin conflicts (especially LSP classes)
6. ? Clear cache or reset settings

Basically these common reasons. In most cases, the settings are caused by errors or plug-in conflicts. Start with the basic settings and eliminate them step by step, and the problem can usually be solved.

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