How can i delete bookmarks on my samsung chromebook 303c

Question edited for clarity.

Reset your Chromebook to factory settings

Google Support https://support.google.com > chromebook > answer
Factory reset your Chromebook · Sign out of your Chromebook. · Press and hold Ctrl + Alt + Shift + r. · Select Restart. · In the box that appears, select Powerwash ...

1. On your computer, open Chrome.
2. At the top right, click More Bookmarks.
3. Find and click a bookmark.

To open bookmarks faster, use the bookmarks bar. Your bookmarks will show under the address bar. Click a bookmark to open it. To turn the bookmarks bar on or off

To help you understand and delete the bookmarks from your android tablet, make sure you really want to delete it, and that you've chosen the right bookmark because this would delete the bookmark completely.
Please follow the steps given below:
- Launch your Android web browser.
- Tap the 'Bookmarks' icon in the top right hand corner.
- Tap and 'Hold the bookmark' you want to remove, until a window pops up.
- Select the 'Delete bookmark' option, then tap OK.

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this might help you... How To Enable Or Disable Sync On Your Chromebook Chromebook Samsung

Here is a trick you can use: You can put the Chromebook into Developer Mode, then once it is in Developer Mode you can switch it back into normal mode and it should totally wipe the Chromebook without requiring any USB flash drive or any SD flash card etc.
But remember that just like a Powerwash or a USB ChromeOS restore, this process will wipe all local files you have stored on your Chromebook's SSD.
best of luck ! And be certain to return to let us know if this helped.
-JW
PS: Remember that when using a Chromebook you should never store important files locally on the SSD HardDiskDrive shelf; Instead, store them in your Google Drive or if you must store them locally use something like flash storage media. A Powerwash or a switching into Developer Mode will wipe all SSD local files.
https://support.google.com/chrome/a/answer/1360642?hl=en for Samsung Chromebook XE303C12-A01

1. Press ESC + + POWER. The screen displays a yellow exclamation point (!).


2. Press CTRL + D to begin dev mode, then ENTER. The screen displays a red exclamation point.


3. Press CTRL + D, then ENTER. The Chromebook deletes its local data, returning to its initial state. The deletion takes approximately 15 minutes.


4. When the transaction completes, press the spacebar, then press ENTER to return to verified mode.

Try holding control and pressing the minus key to reduce the size or click on the blank area above address bar

Open your browser and enter the bookmarks menu. Long press the bookmark you want to delete and select "delete/remove bookmark". You may need to scroll down to see this option.