To everyone, especially to @jjev so far, thank you for your audience 
If you could point me to where I can find and how to access the open(animated: boolean) method, mentioned in the ion-menu documentation, which is not the same as the open(menuId: string) method found in the menuController imported from @ionic/vue …
BTW, if someone asks for the package.json dependencies:
"dependencies": {
"@capacitor/app": "5.0.2",
"@capacitor/core": "5.0.4",
"@capacitor/haptics": "5.0.2",
"@capacitor/keyboard": "5.0.2",
"@capacitor/status-bar": "5.0.2",
"@ionic/storage": "^4.0.0",
"@ionic/vue": "^7.0.10",
"@ionic/vue-router": "^7.0.10",
"ionicons": "^7.0.0",
"pinia": "^2.1.3",
"vue": "^3.3.4",
"vue-router": "^4.2.2"
},
"devDependencies": {
"@capacitor/cli": "5.0.4",
"@vitejs/plugin-legacy": "^4.0.2",
"@vitejs/plugin-vue": "^4.0.0",
"@vue/eslint-config-typescript": "^11.0.2",
"@vue/test-utils": "^2.3.0",
"cypress": "^12.7.0",
"eslint": "^8.35.0",
"eslint-plugin-vue": "^9.9.0",
"jsdom": "^21.1.0",
"typescript": "^4.9.3",
"vite": "^4.1.0",
"vitest": "^0.29.2",
"vue-tsc": "^1.0.24"
},
