> ## Documentation Index > Fetch the complete documentation index at: https://docs.equals.com/llms.txt > Use this file to discover all available pages before exploring further. # Advanced formula editor > Use a code editor to easily debug formulas The Formula Editor provides a roomy, code-like canvas to edit your spreadsheet formulas easily. It can be used to diagnose and debug formula errors with a line-by-line breakdown of each subexpression. # Getting started There are multiple ways to activate Formula Editor from a cell in a workbook: 1. Hit `Cmd + Shift + Enter` to open the Formula Editor directly. 2. Hit `Cmd + K` (or `Ctrl + K` on Windows) to open up the [command bar](https://docs.equals.com/docs/command-bar). Then, search for `Explain Formula` or `Edit cell (expanded)`. 3. Hit the ↖️ icon on the right side of the formula bar. On opening, the Formula Editor will automatically break down the formula in your cell and evaluate each subexpression. You can type directly in to your Formula Editor to modify the formula, and then save or discard your changes. # FAQ ### Can I modify formulas directly in the Formula Editor? Yes, you can type directly into the Formula Editor to modify the formula as needed. ### Can I undo changes made in the Formula Editor? Yes, if you select `Command` + `Z` or `Undo` from the toolbar, you can revert changes made in the Formula Editor. ### Is there a limit to the complexity of formulas that the Formula Editor can handle? No, the Formula Editor is designed to handle a wide range of formulas, including those with significant length and complexity. *** [AI Assist](/docs/ai-assist) [Dashboards](/docs/dashboards)