1. Through the power and sleep settings, the device can enter sleep and automatically lock the screen after being idle; 2. Use the Group Policy Editor to configure the computer to automatically lock after the user's idle timeout; 3. The home version system can achieve the same function by modifying the registry; 4. Create a scheduled task to regularly detect the system idle state and execute the lock screen command after reaching the threshold.

There are three ways to change the default PDF opening method to your desired application: through File Explorer, System Settings, or Control Panel. First, you can right-click on any PDF file and select "Open with" and check "Always use this app"; secondly, enter the "Default Application" setting through [Win I] and specify a program for .pdf; you can also manually associate it through the "Default Program" function of the control panel. If it is still changed after setting it, you need to check whether the security software has reset the association, and make sure that the PDF reader's own settings have been set to default to avoid conflicts between multiple PDF software and lead to unstable association.

Folders that cannot be renamed may be due to being occupied, insufficient permissions, or system settings issues; 02. You can end the occupying process through Task Manager and Resource Monitor; 03. Run File Explorer as an administrator to increase permissions; 04. Reset folder options to fix interface failures; 05. Check and repair the user folder path in the registry; 06. Use tools such as IObitUnlocker to force unlock.

UAC prompts can be reduced or turned off through Control Panel, Group Policy, or the registry. First, adjust the UAC slider in the control panel to "Never notify"; secondly, professional version users can use the Group Policy Editor to disable "Administrator Approval Mode"; finally, advanced users can modify EnableLUA, ConsentPromptBehaviorAdmin and PromptOnSecureDesktop in the registry to 0 to completely turn off UAC, which requires a restart to take effect.

First, check whether the function is normal by running compmgmt.msc. If abnormal, repair the system files (sfc/scannow and DISM), correct the registry call path and configure permissions. Finally, create a desktop shortcut as an alternative.

Turn on incognito browsing in UC Browser to protect privacy. Select "Incognito Browsing" through the tab icon on the main interface or slide the sidebar to enter "Incognito Mode". You can also create a desktop shortcut in the settings. After startup, a prompt will be displayed at the top of the page and the operation will leave no local traces.

You can cast mobile videos to your computer through QQ browser cross-screen traversal, Miracast mirroring or third-party software. First, make sure the device is connected to the same WiFi, use the same QQ account to log in to the QQ browser on both the phone and the computer, click the "Cross-Screen Travel" button on the video playback page and select the target computer to complete the screencasting; if the computer supports Miracast, you can click "Screen Mirroring" in the phone control center to select the computer name to connect; you can also scan the QR code through third-party software such as ApowerMirror to achieve high-definition transmission.

First clearing cache and history can solve the problem of slow loading or abnormal display of UC Browser. Specific operations include: clearing cache, browsing history and cookies through UC Browser settings menu; clearing cache separately in "Downloads and Cache" to retain login status; or force clearing UC Browser's cache and data through "Application Management" of the mobile phone system to free up storage space and improve browsing performance.