My Zed Config

keymap.json

[
	{
		"context": "Editor",
		"bindings": {
			"alt-up": "editor::SelectLargerSyntaxNode",
			"alt-down": "editor::SelectSmallerSyntaxNode",
			"ctrl-cmd-up": "editor::MoveLineUp",
			"ctrl-cmd-down": "editor::MoveLineDown"
		}
	}
]

settings.json

{
	"assistant": {
		"default_open_ai_model": "gpt-4",
		"provider": {
			"name": "openai",
			"default_model": "gpt-4"
		}
	},
	"vim_mode": true,
	"features": {
		"copilot": true
	},
	"show_inline_completions": true,
	"theme": "Rosé Pine Moon",
	"buffer_font_family": "Monolisa Variable",
	"soft_wrap": "editor_width",
	"hard_tabs": true,
	"tab_size": 2,
	"format_on_save": "on",
	"buffer_font_size": 16,
	"buffer_line_height": {
		"custom": 1.7
	},
	"indent_guides": {
		"enabled": false
	},
	"tab_bar": {
		"show": true
	},
	"semantic_index": {
		"enabled": true
	},
	"lsp": {
		"solargraph": {
			"initialization_options": {
				"diagnostics": false,
				"formatting": false
			}
		},
		"ruby-lsp": {
			"initialization_options": {
				"diagnostics": true,
				"formatting": false
			}
		},
		"tailwindcss-language-server": {
			"settings": {
				"includeLanguages": {
					"erb": "html",
					"ruby": "html"
				},
				"experimental": {
					"classRegex": ["\\bclass:\\s*['\"]([^'\"]*)['\"]"]
				}
			}
		}
	},
	"languages": {
		"Ruby": {
			"language_servers": [
				"tailwindcss-language-server",
				"ruby-lsp",
				"!solargraph"
			],
			"formatter": {
				"external": {
					"command": "bundle",
					"arguments": [
						"exec",
						"rubocop",
						"--server",
						"--auto-correct-all",
						"--fail-level",
						"error",
						"--stdin",
						"corrected.rb",
						"--stderr"
					]
				}
			}
		},
		"Markdown": {
			"soft_wrap": "preferred_line_length",
			"preferred_line_length": 80,
			"hard_tabs": false
		},
		"YAML": {
			"hard_tabs": false
		}
	},
	"file_scan_exclusions": ["*.git", "*.DS_Store"]
}

You can disable it by setting format on save to off. You may want to disable it globally and then enable it for specific projects with a .zed/settings.json file in the project.

Thanks Joel. Sounds like a reasonable approach.